http://store.steampowered.com/app/455940/
💎💎💎💎💎💎💎💎
STEAM KEY REGION FREE GLOBAL

Odd||Even is a math and logic based, integer placement puzzle game created by irritatingFLY studio.
Oddeven-game

Features
★ powerful puzzle generator with natural interface
★ feature rich mathematical-software
★ full control given to users
★ sharp graphics
★ 90 logical selected puzzles
★ full rights (once purchased you can use generated puzzles as you like, even for commercial use)