Turn objects. Draw lines. Hide/Unhide objects. Bounce from (destructible at times) obstacles and walls. Splitters. Activation switches.
Do this all to score yellow circles.
That's it? YES. That's it.
You will say: LOL, LFMAO. ROFL. I will say: Play.The.Game.
The mechanics are simple - just a few tricks, BUT that's where the game starts.
You have the tools. You know mechanics. Now beat those puzzles.
Smart use of mechanics and and variety of object placement in levels makes this game so addicting.
Sometimes you can solve a level in a few moments with just a few moves, but you have to crack it first.
It's a puzzle game in the end. You can just beat a level or you can beat it to get C, B or A score.
Solving it is one thing. Solving it to achieve A rating is another.
Replay value? Big. Level editor. Over 39 000 custom levels. "A score" for vanilla game levels.
Game gets more difficult the farther you go. Is it really difficult? Nope. It has a nice balance and I didn't notice any spikes.
Of course the last level is way more difficult that the first one :P
Sometimes you need reflexes for certain puzzles, but it's nothing extreme. Just a bit of good timing and you will be fine.
Graphical presentation is minimalistic, but it fits this type of game perfectly. You don't play this game for eye-candy. You play this game to improve (or develop) you brain-using skills.
Get this game if you like solving puzzles. It's fun.