1001 Mystery Genie Fortunes Slot by Play'n GO

Free spins split into a two-layer system. Three or more scatters award 8 to 15 spins, and during those spins, Mystery Symbols reveal regular symbols carrying Locks - each one holding an instant prize between 1x and 5x total bet. But the prizes don't pay out automatically. Keys need to land on that same spin, and the prize multiplies by however many keys are present. Keys without locks sit idle. Locks without keys hold their value hostage. When both line up, especially with two or three keys visible, the instant prizes stack on top of normal payline wins and the round gets productive fast.

Outside of free spins, Mystery Symbols work differently. All of them reveal the same regular symbol, or individually transform into Wilds or Magic Lamps. The Genie upgrades revealed Wilds into multiplier versions carrying 2x through 5x, and multiple multipliers on one payline add together rather than multiply. The lamp is the chase target - when one appears, the Genie turns into an Expanding Wild covering an entire reel and triggers a respin. New Mystery Symbols generate on the respin, and another lamp keeps the streak alive. Each consecutive lamp pushes the Expanding Wild's multiplier higher, from 2x up to 5x by the sixth lamp in a row.

Key symbols also appear during base spins, separate from Mystery Symbol reveals. More keys on screen means a better chance of unlocking the Mystery Chest, which pays one of four fixed prizes: Mini at 5x, Minor at 20x, Major at 100x, or Mega at 1,001x. That last number is a nod to the Arabian Nights source material, and it accounts for most of the game's ceiling on its own.