House of Doom 2: The Crypt is a 5 by 3 video slot game with 20 paylines. The game has different themes which affect the appearing WILD symbols in base game, the music and the FREE SPINS feature. The theme changes randomly into a different one after a FREE SPINS or CRYPT SPINS feature has ended. QUEEN OF THE DAMNED, FIRE MISTRESS, and METAL PRIESTESS themes are indicated by green, purple, and blue backgrounds respectively.

During the base game, SPIRIT GATE can randomly appear on any reel. The active WILD during SPIRIT GATE feature is random. If a WILD symbol lands in it, the WILD expands and triggers one re-spin with a special bonus feature, which does not include SCATTER symbols. Expanded WILD is held in place during the re-spin.

QUEEN OF THE DAMNED WILD symbol landing in SPIRIT GATE adds SPIRIT GATE to all reels for the re-spin. WILDS landing in SPIRIT GATES during re-spin also expand but do not trigger further re-spins. FIRE MISTRESS WILD symbol landing in SPIRIT GATE awards a random MULTIPLIER for the re-spin, which can be one of x2, x3, x5 or x10. METAL PRIESTESS WILD symbol landing in SPIRIT GATE turns all RITUAL RELIC symbols into SKULL symbol.

8 FREE SPINS can be triggered by 3 SCATTER symbols on reel 1, 3 and 5. In FREE SPINS there is only one type of bonus available, which is determined by base game theme. It is possible to have more than one SPIRIT GATES activated on each spin.
Explore the kingdom of the Snow Queen and reward yourself with fantastic riches! Snow Queen symbol is wild and whenever she appears on any of the reels, it expands making that whole reel wild! During Free Spins, the Frozen Wild Feature occurs more frequently.

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About Expanding Wilds Games

Expanding Wilds is a casino game mechanic that is often found in online slot machines and video slot games. It is a variation of the traditional wild symbol, where wild symbols can expand to cover an entire reel or even the whole game board.

When a player hits an Expanding Wild symbol, it will expand to cover the entire reel, or in some cases, the whole game board, increasing the chances of hitting winning combinations. The expanded wild symbol can substitute for other symbols on the reels, and this feature can lead to multiple winning combinations in a single spin. Some games also have multipliers or other bonuses that are associated with the Expanding Wilds, making them even more valuable.

This game mechanic can be a great way to increase the chances of hitting winning combinations and adding an extra layer of excitement to the game. It is a popular feature in online slot games and has been used by many game providers. Some of the most popular slot games with Expanding Wilds feature are "Starburst" by NetEnt, "Pirates Plenty Megaways" by Red Tiger Gaming, "Helloween" by Play'n GO and "Wild Chapo" by Relax Gaming.