In the Snake game you control a serpent, which is roaming around the garden looking for apples. Be careful, though, because when you catch one, not only will you become longer, but you'll move faster. Running into yourself or the walls will end the game.
Scroll up your trackball when the games asks to "press up to play".
In Lunar Lander the player must correctly land a lunar module exactly on the green landing pad, located on the surface of the moon. The moon's gravitation field pulls the module down. Use the engine to resist hard landing but remember that the lunar module has a limited amount of fuel. The game comes from the Android SDK.