38i has created a remake of the old school game Lunar Lander in which you need to make the spaceship land softly on a planet.  To do this you're equipped with thrusters to counteract the speed at which the ship is falling.  The site's instructions say:

To accomplish a perfect landing, you have to touch the ground with a speed greater than -10m/s (not that you are descending, thus it is negative speed).
Tap on the thrust control to set the thrust engines to control you descent.

I have to say this is a really hard game.  I kept crashing the lander over and over and over.