You know, I got 7 Billion humans for 20%. I absolutely forgot to mention it here, though it is still 20% off.
It's a Programming language puzzle. I started the game, and am loving it all the while. It is quite challenging at parts. And there are challenges in each puzzle that are really hard. I started the game challenging myself to not continue until I have completed all the challenges in each puzzle without looking up the answers on the internet.
I highly recommend this game even at full price for anyone who love programming.