Pong with something to break: return the ball, crack the shield behind your opponent's paddle, and spend the wall power-ups.
The Nokia classic rebuilt in Flash: steer the snake to the food, grow longer and keep off the walls.
A green block, a red square and a walled maze: walk the block through the corridors with the arrow keys and find the way out.
A Red Cross base camp under a ticking clock: read the reports, weigh the jobs and send the right team before the hours run out.
A whole European campaign with one player under your control at a time and a fatigue bar that will not forgive.