Wild Worlds by NetEnt is a 5-reel, 5-row Avalanche video slot set in a futuristic city where bird heroes face monsters. Wins are formed on horizontal or vertical lines of three or more matching symbols, and winning symbols explode before new ones fall into place for another chance to win. The game uses high, medium and low value symbols, plus a Scatter that triggers the bonus feature.
A random Destroy Feature can appear after a non-winning round, leaving only one symbol colour on the reels before a fresh Avalanche begins. Hero Wilds also play a part in the main game, with remaining Hero symbols turning into Wilds after the matching Hero symbols have been removed from a win. This structure gives the slot a sequence of repeated cascades rather than a single spin result.
Three Scatter symbols award 8 Free Spins, with the bonus round rotating between Dark Forest, Ice World and Fire Lands. Each world has its own wild behaviour and monster battles, including Captains and a Boss with health points. The demo version is available to play for free, allowing players to practice before playing for real money.