Premium GameMaker tutorials for free - Learn to use the program while making actual games
Mars Lander Builder can be downloaded from Mod DB through AdFly here:
Adf.ly
Alternate link:
Indiedb.com
Mars Lander Online Runner Edition can be found here:
Assemblylinegames.com
For over 100 levels for Mars Lander, check out this forum link:
Indiedb.com