Yellow, orange, and red combo fire (below 500 combo)
Blue combo fire (above 500 combo)
Combo fire was a background gameplay element that originated from the Osu! Tatakae! Ouendan! DS game, and eventually got integrated into osu!. This would display a burning, yellow flame after obtaining the first combo milestone. If the player obtained a combo of 500, the combo fire would change colour from yellow to blue. The fire would extinguish if the combo was broken, but it would reappear if combo was regained.
Combo fire was disabled on March 5, 2013 due to performance concerns.