You never create a Variable called Budynek. But i don't if it's like a master boss or something.. Oh. And you want a chance to do that. Well you gotta use that dang 1 to 100 chance thing. Sec i'll find it. Liquid Arrow
Events
Unit - A unit starts casting an ability
Conditions
(Ability being...
Ideas:
Starpower (like in normal GH - i only tried the first so i dont know if its been removed)
Highscore system in-game (Not something that is gonna save, just among players)
Bonus song/hidden songs/events (tell me if you need some more creativity or deeper description)