I enjoy playing RTS and other sort of games with nice graphics and gameplay, but i definitely love playing those tiny little evil games which require minimum resources as far as the PC is concerned, but maximum capabilities as far as the player is concerned. I present to you my 3 all-time favorites:
#1 - Rick Dangerous
Thankfully, there is a cheat! You are Rick, and definitely you're dangerous. You have to go through this maze full of traps and enemies. All you got are bullets and dynamites, and a lousy lame stick...
Link: Rick Dangerous
#2 - The brain game
I told you, some games require minimum PC power, maximum human power. This is one of these. All you have to do is try to catch the small ball with the arkanoid-thing that you move with your mouse, while keeping the big ball in balance... Sounds easy?
Link: The Brain Game
#3 - Snubby Lands' World hardest game Vol. 1 and 2
Reflexes, concentration and absolute finger control is what it takes to beat this game. The goal is to finish all levels with as less deaths as possible. Time here is not a factor...
Link: Snubby Lands' World hardest game Vol.1
Snubby Lands' World hardest game Vol.2