The collecting tiles in winning combos, win x amount thru bonus spins and win x amount thru free spins can be the hardest and I'd avoid them. XP does carry from one slot to another if you decide you're getting nowhere with the one you're playing. You can start a slot to see what the parameters are to clear the level, back out, and check another slot to see the parameters of that one to see which is easiest. So if it takes 100 spins for a level, it would only take 50 spins with a 2x multiplier or 25 with 4x. Also, when you bet high amounts you can get 2x, 3x and 4x multipliers for your xp bar for 10 mins. Could be amount of spins, could be spin max bet x amount of times, could be to collect tiles or collect tiles in winning combos etc. Each slot has its own requirements to complete the level. I don't know if it's the same game, but I did another club vegas offer.
