Gold Oasis Slot by Pragmatic Play

A random symbol duel can trigger on any base game spin. One character symbol is chosen and replaces up to 10 positions on the reels with copies of itself, forcing clusters of matching symbols before the win evaluation. It is a brute-force approach to generating ways wins on a 243-ways grid, and the replacement count (up to 10 of 15 positions) means it occasionally covers most of the board.

Three golden keyhole scatters open the free spins round, where the paytable flips: every winning combination pays as if it were five of a kind, regardless of how many reels the symbols actually cover. A three-of-a-kind match on the top character pays the same 6x bet that normally requires five across. This compressed paytable turns small matches into meaningful hits.

During free spins, collecting two more scatters triggers a duel between two random symbols. The loser is permanently removed from the reel strips for the rest of the round, replaced everywhere by the winner. Each duel also adds extra spins. As duels stack up, the remaining symbol pool shrinks, which concentrates the reels toward fewer - and higher-paying - symbols. Two buy options exist: 100x for a standard free spins entry and 200x for an enhanced version.