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VIKING RUNECRAFT APOCALYPSE is a 7x7 cascading video slot game.
Wins are achieved by getting 5 or more symbols in clusters. These are removed and new symbols fill up the grid. Cascades continue until no more wins can be created.
On a non-win round, a cluster of 5 to 8 mystery symbols are added to the grid and reveals 1 random type of symbol. It can only create a win if there is an adjacent symbol of the same type to the revealed symbol. The feature can only be triggered once per game round.