Playing all Levels in KR FRONTIERS AND ORIGIN isn't enougth to fully uprade all heroes and once you collected 110/110 stars you don't have too much reasons to upgrade heroes left back with levelling. I also think that this levels actually give to the player more reason to fully upgrade all the heroes. With that beeing said it would be cool if there was a leaderboard for those challenges. My point is that bringing back endless mode would be great to give KR games more replayability and since these levels have been already made for mobile it wouldn't be too hard for devs to implement them also for steam versions. The original one had so much more levels in post game. There is plenty of free space on maps and compared to the first KR new games KR FRONTIERS AND KR ORIGINS have less content. Devs didn't made those on steam version because there isn't gnome shop.To be honest i think it's way better without this 'extra help' that in my opinion just takes away the skill from the challenge to reach highest round. In mobile versions there are 2 endless mode levels in each KR game.