Never seen a bug with the "secret marker" ... but to be honest : so far I never played the game further than ca level 12*, maybe that's why
* but restart already many times !
You are doing well. Game about 12 lvl start to be wonky. 15+ is underdeveloped. It was probably good bussines solution, cose only 5% customers finished the game.
Maybe they don't finish because the last half is wonky. I hope this isn't really true because I've started many games to level 11 or 12 and always want to restart at that point. I always feel as if there is something wrong I'm doing but maybe it's not me but the game design? My latest game is on level 10 right now and you're making me depressed.