Zeno Clash 2 has issued a free update today adding a pair of fresh challenge modes: Framerate and Coliseum.

Framerate mode pits players against waves of wireframe enemies who spawn based on your computer's performance and must be vanquished to maintain a consistent frame rate. Coliseum drops players into a battle against against 50 waves of increasingly difficult enemies, with no limits on the number of allies players can employ. In addition to the new modes, you'll notice Zeno Clash 2 also supports Steam Trading Cards now.

In what was most certainly an unplanned coincidence, all versions of Zeno Clash are on sale through Steam until August 1. You can grab the standard edition for $8 or the original game for $2.