Challenging, rewarding, fun, and tough. These are the adjectives I would use to describe Dota 2.

A funny physics engine that allows you to create bizarre things only from your imagination. Online has tons of fun multilayer modes as well like TTT.

My most-played game, TF2 is a great game. Not to mention it's free-to-play without being pay-to-win.

Fun puzzle game with good characters and voice acting. It's puzzles are challenging, interesting, and unique. It's also got good lore, which is cool.

Fun little medieval physics game. Great to play after a long day.

AMAZING SHOOTER WITH LOTS OF GUNS, GUNS, AND GUNS. STELLAR GAME PLAY, STORY, AND CHARACTERS. A MUST BUY!

Best multilayer shooter on Steam. It's mechanics, community, variety, and skill based game play make it extremely addicting.