Unintentional Christmas Tree is a fun and small arcade action puzzle game. You just lay the same color blocks on top of each other.

https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjLedSb_Pn_tfjdspplo6jdun1R5bG2LOEOYkC_RCVGfk9s1cd3mFRX25FKe_seHjAW-B-1dIeDwH27PUVPn_NkjYbWDAIR2Y0mknyI1rGRzVDM5cr5MEQRj7W6Ch57MmZLjmfHL7r2woM/s800-Ic42/christmas.raw.gif

It has two modes, easy and hard. In hard mode, you can’t make any mistakes, e.g. red on green, or that would be game over. In easy mode, let’s just say that you can break this tree really easily.

Unintentional Christmas Tree was created by Joseph Lansdowne on 2012-02-27, written in Python 2 with Pygame under New BSD License (3-clause), currently git-da562ee (2012-02-27).

The question is not red or green but left or right.