https://store.steampowered.com/app/1431620/Cybercube_battle/
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STEAM KEY REGION FREE GLOBAL

Single-player battle royale game.
The goal of the game is to remain the only survivor.
Every 60 seconds the circle narrows.
In order not to die, you must keep in a circle.
A choice of 5 characters.
Several types of firearms. (machine guns, pistols, shotguns, sniper rifles)
There are also melee weapons. (axes, knives, machete)