To qualify you must first own at least one Qubic game, and Coloring Book, at the link below, is free and counts as the game:

Download Robonauts for free between 12/10 and 12/15:

They will have new games available each day starting December 16, including:
Geki Yaba Runner
Puzzle Book
One Strike
Wreckin’ Ball Adventure
Mana Spark
and a Mystery Game for the last game.