Boss rush lv25 or up x10, this mission to acquire Gladiator skill. May I know what it mean up x10?

It means that you need to kill 10 times boss or bosses which is or which are lv 25 or higher.

Ex: If your, lets say Red Nose is lv 25 or up, you need to defeat him 10 times on x1 miltiplauer, or if you have more than one boss on lv 25, you can combine that bosses, say 5 wins on one and 5 wins on second, or any ratio bitween that you can.

Thank you for your information. Sadly my Red nose only level 8

Red Nose is just example, you can deffeat any other boss, provided he/she is at list lv 25..

TO MULTIPLY THE RUN  OF YOUR RED NOSE BOSS RUSH,IT SHOULD BE LEVEL 10 TO BE 2X RUN EQUIVALENT OR 2X MLTIPLIER PER RUN MEANING YOUR DOING TWICE IN ONE RUN IF YOUR RED NOSE LEVEL REACHES LVL 10. AND IF IT REACHES LVL 20. 3X MULTIPLIER.

IF YOU USE A COMBAT PLUS IT WILL BE FIVE TIMES PER ONE RUN

Old post but Jast is so helpful way to represent gladiator.