I was playing the tutorial for fun, when I got some idea for challenges during the tutorial where you need to build to hold level 12. The idea is the following: You add a new mode "challenges". In here are challenges for certain rounds. For example (just saying something), hold level 13 when you get 4eyes + furbolg with 1900 value and specific 8 fighters to pick from. Maybe you can ask some top players to provide you with a challenge and make like 10 or 20 of them (and you get an icon if you complete them all or w/e). And maybe to be expanded and made even more fun later (like special boss you have to fight or w/e). I think it's a lot of fun, and can also help players greatly to value their units and increase their skill in picking and defending against specific waves. I also think it should not be THAT hard to implement (since it's basically already in the tutorial)?