http://store.steampowered.com/app/375790/
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STEAM KEY REGION FREE GLOBAL

Inspired by the classic DOS game Jump 'n Bump, Build 'n Bump retains all of the same head-stomping, multiplayer fun with a twist. You can build your own levels right before you play on them!

Featuring...

★ 2-6 players simultaneously (4 controllers, 2 on keyboard)
★ Local and online multiplayer
★ The ability to save and load created levels
★ Five block types to build with (regular, spring, platform, spike, and dissolving)
★ Single-player practice mode against stationary targets
★ "Level master" mode where one player edits the level in real-time while everyone else fights