The maximum we see is 30 times our bet, but it's interesting to keep you at the edge of the seat. When the Xmen slot tries to do this, we are quite unbelievable because "unlimited" usually means '15 / 20'. By changing the two free spin bonus games, you can end up with huge multipliers (16 times the maximum on a single payline) or sticky freeze symbols, which can bring some five wins.
Thor Android and iOS slots are basically a beautifully balanced machine. This is not to say that you should not be careful about your budget.