Talk:Underdrome
From Ultimania, by way of gamefaqs:
Combo Bonus: "HIT COMBO" appears on the upper-right of the screen; it increases by 1 per a defeated enemy and returns to zero if the round ends or if no enemies are defeated within a period of 10 seconds. If HIT COMBO is 2 or higher when Prizes appear, "HIT COMBO ÷ 2 (decimals are truncated)" Prizes (large) will appear in addition to the normal prizes--SCORE increases by 10 per one. However, this does not occur in horde battles.
Double Score Mode: When the number of enemies defeated in the tournaments reaches a multiple of 50, "Double Score Mode" is activated. Double Score Mode continues till before you defeat the last enemy in the next round; in the meantime, the number of Prizes increases twofold (Prizes (large) are unaffected). It should be noted that leaving to the World Map or loading a save file resets the number of defeated enemies to zero. Also, boss enemies and horde battle enemies do not add to the count.