Sig.NULL (Steam key|Region free)

Sig.NULL (Steam key|Region free)

This is a remake and expansion of an earlier PuzzleScript game, Signal. What I thought was so brilliant about the original is that while the rules never change, the level design is such that your ability to fully comprehend and exploit those rules shifts radically over...

Steam Trading Cards - YES!
http://store.steampowered.com/app/501930/SigNULL/

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Additional information:

Instructions for activation keys to Steam:
1) Download and install the Steam client
2) Register an account or log in with your username in the existing one.
3) Go to the "My Games" and select "Activate via Steam ...", and enter the key received after payment.
4) Once activated, the game will appear in the game list (Library) and you can download it