Radium is a minimalist and physics-based skill game, featuring unique game controls.
User reviews:
Very Positive (88 reviews) - 84% of the 88 user reviews for this game are positive.
Release Date: Mar 29, 2014

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October 12

Ra² is now on Steam Greenlight!

Hey internet people. I'm working on a new Radium which is now available on Steam Greenlight and I need your help.
Ra² includes a better level design, Steam-Leaderboard, portals, rotating levels and more!


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About This Game

Radium is a physics-based skill game, featuring unique game controls. A game which avoids any non-essential elements and focuses on the elementary minimum. By pressing the left or right arrow key, the orb is pulled into the direction of the corresponding tractor beam. Entering yellow mode, polarization gets inverted and the orb will be pushed away. Switching from normal to yellow mode can happen multiple times per level.
Easy to learn and hard to master. A must-have for every fan of arcade games, who doesn't shy away from challenges.


• 130 levels of increasing difficulty
• Unique physics-based game controls
• Automatic zoom and scroll function
• Polarization change
• Pure minimalism
• Steam achievements
• Steam trading cards

System Requirements

Mac OS X
SteamOS + Linux
    • OS: Windows 8 / 7 / Vista / XP
    • Processor: 2 GHz Dual Core
    • Memory: 512 MB RAM
    • Graphics: DirectX 8-compatible graphics card with at least 32MB of video memory
    • DirectX: Version 9.0c
    • Storage: 30 MB available space
    • Sound Card: DirectX 9.0c compatible
    • OS: Mac OS 10.6+
    • Processor: 2 GHz Dual Core
    • Memory: 512 MB RAM
    • Storage: 30 MB available space
    • OS: Ubuntu 12.04
    • Processor: 2.2 GHz Dual Core
    • Memory: 512 MB RAM
    • Storage: 30 MB available space
Customer reviews
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Very Positive (88 reviews)
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49 reviews match the filters above ( Positive)
Most Helpful Reviews  In the past 30 days
1 of 1 people (100%) found this review helpful
0.3 hrs on record
Posted: October 17
Product received for free
Thanks for the game, man ! : ) Very cool
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1 of 1 people (100%) found this review helpful
6.2 hrs on record
Posted: October 17
Product received for free
simple, it has 2 controls, left or right.
the maps however get increasingly harder, and with the mirror effects it gets even harder.
a simple yet challenging puzzle game, good for if you take a quick game during coffee breaks, or whenever you have a few minutes to spend.

though i must i am abit biased seeing as i got the game for free, but honestly its a good game, and there is a sequel out

the game is also free on the appstore and playstore for android, so if you dont feel like buying it, just download on the phone. (only needs in-app purchases permission, not all the other jazz that most apps these days appearantly need)
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Most Helpful Reviews  Overall
20 of 20 people (100%) found this review helpful
3.1 hrs on record
Posted: July 27, 2015
RADIUM is a game I like VERY much. I anticipated a significant challenge, and something worth a try to entertain myself for at least an hour or so. I got SO much more for a very low price. ($2.49US on sale.)

The premise is that a ball is to be moved through many different maze-type layouts. Nothing new there. But what is new is the method of movement. Two turrets(?) shoot rays from opposite sides of the screen, as the player requests by means of the arrow buttons, to pull the ball toward that spot in order to progress through the layout. That in itself is quite enough to add a challenge, but the turrets (for lack of a better term) may do just the opposite and repel the ball. Or…..the direction of attraction may switch upon hitting a specific symbol. Sometimes frequently and repeatedly within the same level (pull… push… pull… push…) And there may be saw-blade walls, floors and/or ceilings that will “pop” the ball upon contact. And sometimes, in addition to maneuvering through the maze, a player may be required to hit targets through the rather imprecise control exercised through the turrets, THEN complete the maze. And of course, many and varied combinations of everything mentioned above, to the tune of nearly 300 puzzles. I say puzzles, because this is far more than a simple arcade type game. Quite frequently the only way to complete the level is through momentum, the very force of gravity that must be accumulated, then expressed through enough force to reach a point by which the circles are able to have a desired effect toward success. The challenge can be just as significant as it sounds.

What makes this game even more special is that each level has three levels of completion: 1. 2 or 3 as measured by the “tabs” of the radioactivity symbol. And until a certain number of success are reached, progress is blocked. But fear not, this isn’t a near impossible level of completion like “Don’t Shoot Yourself”, but a level low enough that it is unlikely a player will ever be blocked to the point of frustration. In fact, it’s not unusual to have as many as 20 levels available, simply by repeated attempts for medium success (or better) by returning to earlier levels. Only at the very early stages have I ever hit the “wall”.

RADIUM rapidly becomes a Zen-like experience of giving up conscious control, and letting actions of the mind replace those of the brain and fingers. And this begins quite quickly (at least in my case, which I don’t imagine to be unusual.) This is one of the best examples of combination puzzle/arcade I’ve seen, and a great game to play if you only have a few minutes, or many hours. HIGHEST RECOMMENDATION.
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21 of 22 people (95%) found this review helpful
1 person found this review funny
2.9 hrs on record
Posted: March 14, 2015
Radium is a fun little physics-based game. You control the big circles at the edges of the screen which influence the movement of the ball within the tracks. Depending on your current form, activating one (or both) of the big circles will push or pull the ball from it. Utilizing this mechanic, you're tasked to traverse some dangerous levels and reach the goal.

I found myself quite entertained by Radium. The simplicity of the mechanics combined with the challenge of the levels really go well together in games like this. On top of making it through the level, there are various par times which award you points depending on which tier (there are three) you place in. These points are then used to unlock additional levels which really had me going back to previous levels to get under the fastest target time in order to unlock more. The progression was never a hassle; the game doesn't require you to perfect every level in order to move on. The balance is pretty fair and none of the times ever seem unobtainable. Also, the controls handle very well. It might take a few minutes to get used to how the mechanics work but once you do it feels great and you know you have total control over the ball.

I recommend giving this a try if you like physics-based games. With 130 levels and a fastest-time based replayability, it's worth checking out. It's relatively cheap and has been bundled a few times so definitely keep an eye out for this one.
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18 of 18 people (100%) found this review helpful
12.6 hrs on record
Posted: March 20, 2015
Can't come up with anything more accurate than "physics-based skill game". You control a ball by attracting it to those two circles, with just two respective buttons. Controls are floaty by definition, but it's mostly fine. Getting used to such controls is a lot of fun. It is very pleasurable to move around each one of those bends.

Then annoying obstacles get in your way... not a big fan of what they add to the game, but you gotta have some challenge! And the game is indeed very difficult. I don't think I'll ever complete every level. But at the same time, getting 100% achievements is easier than that, so that should give the sense of accomplishment. Unlocking all the levels is also quite a feat, because you need to complete preceding levels fast enough. By the way, speedrunning is at the core of the game: your score is based only on time. But don't worry, if you just can't succeed at some poorly designed difficult level, you can compensate for it by improving your time on other, more pleasant levels.

Even though the game is controlled with just 2 buttons, I was left dissatisfied by having to use arrow keys.

There is no music, which is fine. Sound effects are few and not very pleasant, but I didn't have any urges to turn them off.
Obviously, there is no story. The graphics you can see on the screenshots.

You may say the price could be lower, but you do get around 8 hours of gameplay out of it.

All in all a great game. It does have a few problems, but they mostly don't show up until later. Do give it a try.

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13 of 13 people (100%) found this review helpful
17.8 hrs on record
Posted: July 2, 2015
As of this writing, Radium is the only game in which I have acquired every single achievement, and god damn did I earn every single one.

Having picked this up during a groupees bundle, I thought it looked charming; the minimalistic art style and unique control scheme really seemed promising, but nothing to write home about, so I downloaded it and decided to play it til the trading cards dropped. 16 feverish, cathartic hours later, and I can tell you that I am so glad I gave this hidden gem a chance, because it may be one of the most elegant, polished indie gems Steam has neglected to shine a light on.

The mechanics are simple; there is a green ball that you can manipulate with two nodules on the sides of the screen. When pressing down on the arrow keys or moving the joystick, the nodules active, where a thin green line draws the ball towards the one actived. Activate both, and the two nodes will cancel each others inertia. Sometimes the nodes can be in different spots on the screen to affect inertia, but they are always parallel to maximize ball control. Each map introduces a play field in which you must manipulate the ball through winding cooridors to get to a goal. The simplicity is definitely Radium's greatest asset, because with any structure, a game of this nature can make or break on its level design.

Whoever this unknown indie is, they have an amazing sense for variety in small spaces, and a mastery on what I would describe as a perfect difficulty/learning curve union. The opening levels are simple and sublime, generally based on how fast you can navigate the simple curves. On top of the base mechanics, there are boost pads that does exactly what it sounds like, white bricks that you have to occassionally touch to unlock the goal, spikes and saws to die on, and vortexs that cause a polarity shift in the nodules and the ball. The polarity shift in particular is one of the more fascinating implementations. Instead of pulling the ball, you push it with the nodes, and on top of that, gravity is reversed. Simple enough, but the tricky aspect appears when multiple vortexs appear side by side overtop obstacles or narrow, spike filled courses. demanding that the player learn moderation and understanding of the mechanics.

Rare is it that a physics based puzzle platformer genuinely drags out an "Aha!" moment from me, but this one did it often, and with such ingenuity, I came away with genuine amazement. Looking at the credits, it really is just one guy who made this, when I was expect at least four or five. Wonderkind comes to mind. Another thing that really emphasizes the masterful design is the intellegent implementation of the three star system. Each section of the game has to be unlocked through acquring faster times and filling out the radiation icons of each level. All of it is speed based, but rarely do you feel rushed; you just have to have a good hand on the mechanics, and rarely will you feel cheated. This is usually where I would say that the physics break the experience, but they are so fine-tuned I never encountered a situation where I was screwed over by the physics, except in the cases where it was clearly my fault. For an indie game of this nature, that's almost never heard of.

Oftentimes I found that the farther I went in, the easier earlier levels became, which would generally be a natural thing to assume, but once again, the mechanics don't change, it's that damned perfect learning structure in this game. It's a weird and very abstract thing to praise, but seriously, I wouldn't be praising it if I didn't actively notice that the game was naturally teaching me. You'll notice when you play it, and maybe it will make sense then.

All this is amplified by the perfect implementation of the minimalist art style. Green, yellow and shades of black are the only colors you will see, and aesthetically it's very calming, but mechanically, it's genuinely perfect for a game like this. The color change between green and yellow indicate the transition of polarities, which naturally develops an instictual response to the mechanic change, while the varying blacks and greys indicate the path and the obstacles. It's extremely simple and nothing new, but it's implemented very well.

Going to back to level design, I just want to throw out there that a lot of levels are homages to classic games. Some are straight forward in which you click a number switches into the shape of a mushroom, but others can be better hidden. One level that took me a while to finish only recently dawned on me that it was a recreation of the first Pac-Man board, but had enough alterations for the actual gameplay that I didn't even pick up on it til I took the entire board into account. Did I mention that perspective is also a small mechanic? Because it is, and it's done really well in a non-obtrusive way. I'll stop raving now to get to the negatives, promise.

Of all the qualms I had for the game, it came down to two points; Music, and checkpoints. Specifically, neither are found anywhere in the game. While there are sounds, like popping and scrolling over levels and such, there is no music. None. The game does fit well over podcasts and iTunes and such, but while that adds good background noise, the game really should have some, even if it was simply a low key, minimalistic looping track or something. I get that this was made by one guy, and silence does help focus I guess, but come on.

Checkpoints are another thing that I wish some of the later levels had. None of the levels are impossible, don't get me wrong, but some are long and very precise, to the point where a single mistake takes you all the way back to the beginning of a very long, very demanding gauntlet. The game was never a walk in the park just in principle of the three star system, but there are many of the later levels (I'm talking in the 100s range, and even some of the ones before) that demand a level of precision that even with impeccable controls is hard to replicate on multiple tries. Having a halfway checkpoint during some of these stages would've been oh so nice, and since most stages wouldn't need it, I don't see why light implementation would've taken away the challenge, as some enter VVVVV levels of difficulty, and even that had checkpoints. Still, until the very, very end, the rough levels don't really rear their head, and even then they're still doable. It doesn't break the quality, at least for me.

TL;DR: I think the length I went to describe my thoughts and feelings is a bit excessive, but seriously, minor qualms aside, this is a damn great greenlight game lost in the sea of ♥♥♥♥ greenlight games Steam has been flooded with recently. You can buy it for cheep, and it's sublime difficulty and mechanics make it a unique and charming experience. This game has gone into the holy and exclusive pantheon of my Favorites section and is the only game I've 100%ed, and while you may not adore it as much, I have no doubt you'll have a good time. Buy it, and if you like it, say something nice, because this game needs far more love than its gotten.

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19 of 25 people (76%) found this review helpful
3 people found this review funny
2.1 hrs on record
Posted: March 13, 2015
Very cool puzzle game. It's also hard and challenging. Very easy to control with the xbox360 controller. I was really surprised in a positive way with this game. It's really entertaining. If you like puzzles, you will surely enjoy this one. Bought it with a 15% discount. Believe it to be worth full price. Very happy with my purchase. Highly recommend. 10/10
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12 of 14 people (86%) found this review helpful
7.5 hrs on record
Posted: February 16
"Radioactive tractorbeams"
Ingenious skill game in arcade style. You must drag a ball with 2 tractorbeams through a maze of spikes and other traps. The Interface looks pretty much like an Etch-a-Sketch from the 90ies. If the tractor beam turns yellow (after a swirl) it goes into repulse mode. Be aware to link that into your brain. All 130 levels are quite challenging. You can earn 3 stars on a certain time limit and on each 8th level there's an achievement. Unfortunately the game concept contains a levelcap. Which means you must play some other levels to proceed to the next levelset. But altogether a very nice challenging fun.
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6 of 7 people (86%) found this review helpful
18.5 hrs on record
Posted: March 16, 2015
Radium is a fun game, it's combinations between Logic and Timing elements is pure fun...game

I liked that the game was so simple, As a player you just have two Keys to Press. It's easy to play but hard to master. I wish more games nowadays were like this.

10/10 Stars =)
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5 of 6 people (83%) found this review helpful
13.8 hrs on record
Posted: August 31
Radium is a game based on your skill to navigate a ball through hazardous environments, by controlling the ball with two control points that exert force on the ball. Some levels include collecting tokens to open the exit. You should watch that short video on the store page, screenshots can't depict how the interaction with the ball works.

It's very simple, and I found it challenging in exactly the right way. Difficult, but not frustrating. Getting a feel for the physics, retrying and learning the levels is a big element, and you will make progress and it feels very rewarding. There are no random elements in this game, when you fail it will be your fault and you will happily try again. The experience is very smooth, with a very short 2 seconds countdown before the timer starts, and a key that instantly restarts the level if you're about to fail. The levels are quite short, rarely more than a minute long, most of them around 30 seconds I guess.

Then there are time limits to beat to collect stars, and this game becomes essentially a racing game where you have to take corners with the right amount of speed, you will steer and drift and use walls or try other approaches through parts of a level, to try and optimize your time.

There are several gameplay mechanics that the game employs to change things up and keep you entertained (very successfully so, I might add):
- collecting tokens: in some levels, they are distributed around a maze or nonlinear network of tunnels that you have to learn or to optimize your path through them. In other levels they just are scattered in an open area with some hazards, and you have to see how to collect them quickly by just steering the ball as precise as possible around the hazards. You'll often have to weigh risk of collisions against speed.
- special tokens that reverse the ball control, from pulling towards the control points to pushing away from the control points. Often they cannot be bypassed and you have to be ready to adapt to that other "mode", which is always a chance for disaster :)
- limited visibility in some levels: sometimes there's darkness and only your ball's surroundings are illuminated to some extent, which emphasizes your learning the level, with each retry getting better and anticipating the point where to break or where to initiate a curve or something. Like car racing in fog, on a track you are familiarizing yourself with. Some maze levels employ this limited visibility to make you try out branches of paths, and to beat a certain time limit you'll have to remember and take the direct path to the exit.
- many of the later levels have moving hazards (for example sawblades) that follow a path, and timing your movements and controlling the speed of the ball becomes even more important. Things can get tight and you have to be quite precise in controlling the ball. The movements of those hazards are predetermined and never random, so retrying a level will eventually help you master it.

Most of the levels have a very nice difficulty, I rarely spent more than 20 minutes on single level until I was able to beat the hardest time limit to earn 3 stars. Often it was more like 3 minutes. But it's not easy either, it's very normal to initially fail a level a couple of times by colliding with a hazard, or to make it through but not beating any time limit and thus earning only 1 star.

I noticed that within most levels the most challenging/risky parts of that level come up near the level beginning, which is a player-friendly way of designing things because this way you're not wasting time on any part that leads to the risky part where failure is probable. I've seen other games make that mistake but Radium keeps you motivated to retry, and keeps boredom low. There are some exceptions in the last levels though.

For people who care about achievements and 100%ing their games: this game is absolutely friendly in this regard, the later levels pose a challenge but it's not a matter of luck but a matter of skill, there are no broken achievements and the achievements are not grindy.
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Recently Posted
0.9 hrs
Posted: October 20
Product received for free
Simple and addicting, great game to relax to, and quite challanging to hit the 3 mark rates.
Helpful? Yes No Funny
wonko the insane
0.1 hrs
Posted: October 17
Product received for free
From my impressions playing the game, I felt it would be more suited for mobile phones rather than for PC. However, the controls are very easy to learn and the gameplay is interesting, so the pros definitely outweigh the cons.
Helpful? Yes No Funny
3.3 hrs
Posted: October 17
Product received for free
Easy to learn game with a very high skill cap. Definitely worth the store price. If you have three dollars to spare and don't know what to spend it on, this would be a pretty good option.
Helpful? Yes No Funny
0.3 hrs
Posted: October 17
Product received for free
Let me start by saying that this is an first impression and that i got this game for free.

Fun game, may need some better sound. Still, quite unique and enjoyable.
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tá legal
8.0 hrs
Posted: October 17
Simple and... Fun! Awesome combo :3
Helpful? Yes No Funny
0.7 hrs
Posted: October 17
Product received for free
Radium is a a great puzzle game, It is fun and has just the right amount of challenge. I just got this game today and have been playing it for the better part of 3 hours.
Helpful? Yes No Funny
0.3 hrs
Posted: October 17
it has the same colours as imgur.com, how can you not love it?
Helpful? Yes No Funny
0.1 hrs
Posted: October 7
Helpful? Yes No Funny