From the official website:
HEXETERA is an instantly-playable iPhone and iPod Touch triangles puzzle game for everyone.
Charge your batteries and get ready to move, explode, rotate, color, destroy and drop triangle pieces we call PRIMARIES to create single color Hexagon (HEXA) and Diagonal (DIA) target formations for different levels.
Watch out for SECONDARIES, falling pieces that help or hinder you. Power up with Reward Buttons. Earn these when you make formations and charge through your levels. Levels get faster and targets get harder …hexetera, hexetera!