The free spins round in Heimdall’s Gate slot can be opted for payment. There are four options on which to decide: 20 free spins plus 3x multiplier costing 105x your stake, 12 free spins plus a 3x multiplier that will cost you 63 times your stake, 15 free spins with a x2 multiplier at a cost of 43 times your bet and lastly there is also an option of going with the 7 free spins and x2 multiplier worth a price tag of twenty times your bet.