At a glance
BattleBlock Theater has a Mac version: Steam sells it for macOS. The Mac requirements list only Intel: on Apple Silicon Rosetta 2 runs it, and old Mac versions sometimes do not start on current macOS. Try it in Steam for Mac first.
BattleBlock Theater came out on Steam on 15 May 2014, made by The Behemoth.
What your Mac needs
The Mac requirements list only Intel.
Minimum macOS in the Steam requirements: 10.7.
Steam requirements list at least 2 GB of memory for BattleBlock Theater.
Allow about 2 GB of disk space for the Mac version.
How to play
Open Steam for Mac and install BattleBlock Theater as usual.
If the Mac version will not start, you can install the Windows version through Uncork: download Uncork, sign in to Steam and install BattleBlock Theater from there (2 GB). We have not tested it ourselves.
The Windows version through Uncork needs a Mac with Apple Silicon (M1 or newer).
BattleBlock Theater uses DirectX 10: Uncork renders it with D3DMetal.