DVader did a conditional winzone here
https://forum.game-guru.com/thread/215501 you could easily edit that for 10x entitys
his was for a boss entity
for timers check out smallg's posts here lots of useful stuff here
https://forum.game-guru.com/thread/207801
and its worth checking out what synchromesh said
for what your looking for in the first couple of posts you would need to add e.g kills = kills +1 to the exit part of the enemy script
and then add if kills == 10 JumpToLevelIfUsed(e) to your winzone lots of good examples of this in the above link
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