Elevator Action
Such a very simple game, and yet somehow, hypnotic. There's some kinda weird synergy that happens with these old games where the sound and the 'feel' of the game's response to the the controls when you're zoned into it...like buzzing down 6 or 7 floors in the elevator, floaty jump-kick takes out two spies simultaneously (thumpthump!) while you fire in mid air and take out a lamp on the way down (crash!)... then back to the elevator and buzz down 4 more floors...I dunno. Utterly compelling.
Joust
Again with the perfect combination of sound and controller feel. Every pixel, every wing flap, every detail of this game is so well thought out and designed. Everyone who's ever played it knows exactly how it feels to bounce from enemy to enemy, laying waste to all who oppose you... the claustrophobic feeling of knowing that a screenfull of enemies is above you, and you don't feel 'safe' until you're at the top of the screen, in control... With games like that, it doesn't even matter how far you get, how good you are, because just the basic play mechanic is so damn fun.