Games should last around 5 minutes when player are working together, and 12 minutes 30 seconds when they are not, alongside a 15 minute timer at the end of which players lose the match. As such, working together should be 2.5x times quicker.
Stunts should do up to 25x more damage. This is up to 12x extra damage for having momentum above the standard amount (12% more damage for every 2% increase in momentum above standard), and up to 12x extra damage for height (Screen should be 4 jumps high, and as such 12% more damage is dealt for every 1.5% extra height above standard achieved).
As two players is the lowest allowed number, the boss gains an extra 50% per Player above that (150% of total health at 3 players, and 200% of total at 4 players).