Colossal Vikings has 20 fixed paylines and the bet per spin can range between €0.20 and €400, so that's €0.10 to €20 per payline. The game is easy to set up as you simply select your bet and you're done. The game is played on a standard 5x3 board but it will be populated by colossal symbols often so that makes the game a lot more interesting than just a classic slot. Main game and paytable There are only seven symbols in the paytable, and four of them are low-win symbols that still pay decent prizes, better than most slots. The entire paytable follows the same principle of four-of-a-kind win being twice as valuable than a three-of-a-kind, and then five-of-a-kind is double that amount, except for three best low-win symbols that have the top and middle prizes cut off. But the prizes are decent as Shield, the best low-win symbol, can double your stake easily. Major symbols, Wild symbols and Reveal Wild Multiplier symbols can all land as colossal 3x2 symbols in the base game. In the free spins game the maximum size increases, and colossal symbols can land as either 3x2 or 3x3 symbols. The three major symbols are three Vikings, and they pay 5x, 7.5x and 10x for five-of-a-kind respectively, which is a very good prize if we know they can appear as colossal symbols, and the game also has multiplier Wilds. These are awesome – as the win multiplier can be up to x10 and the symbol itself can land as a 3x2 or 3x3 colossal symbol. The win multiplier can be x2, x3, x5 or x10. This is also a paying symbol, with the same prizes as the best Viking. Bonus features The main bonus feature are the free spins, and they are triggered in the usual way, with Scatters. When you land three Scatters you'll get 8 free spins, this will rise to 10 if you got four Scatters, and for five Scatters you'll get 12 free spins. This is the time during which you'll be getting the majority of your huge wins as colossal symbols can appear as 3x3 symbols, which has a huge effect, and it seems the game is giving you better things during the feature than in the base game. But still, even though Colossal Vikings is at its best during the free spins feature, this is a game that can definitely pay well during the base game too. Colossal Vikings Slots RTP Theoretical return to player (RTP) isn't revealed by the developer, but Booming Games usually produce slots that have RTP between 95.30% and 96.50% so we can guess Colossal Vikings is likely in the same range. The game seems to be paying well, and RTP is probably near 96%. One thing that's certain is that RTP isn't low. Conclusion If we knew the RTP we could make a better conclusion about this game, but even without knowing it, it is clear that this is a quality game that can produce huge wins as well as lots of fun. Although it may seem this is a casual slot game for recreational players, it is in fact a serious slot game that can pay well – it has win multipliers up to x10 and these win multipliers can land as colossal 3x3 symbols. What more can you want from a slot game? Colossal Vikings is definitely recommended. You'll find the game in online casinos that feature Booming Games software.