89PHP Mystery Symbol Explained: Four Variants on the Reels

A mystery symbol is a tile that hides what it is until the reels stop. Every mystery tile on that spin then turns into the same paying symbol, and the spin is paid as if that symbol had landed in those places. If you want the wider picture first, start with how slot machines build a spin, then come back for the details here.

What a mystery symbol does, step by step

The sequence is the same in most titles, and knowing it tells you what to look for on the screen.

1. The reels spin and one or more mystery tiles land among the normal symbols.
2. The reels stop, and the game picks a single symbol for that spin.
3. Every mystery tile flips to that symbol at the same moment.
4. The game checks the grid for lines, ways or clusters and pays them.

The pick is made by the game’s maths, not by anything you press, so no stake size or timing changes it. What you control is the title, the stake and when you stop.

Four mystery symbol variants

Studios use the idea in different shapes. These four cover most of what you meet, and each one is worded differently in a paytable.

1. Plain reveal. Single tiles land anywhere and all flip to one symbol. The reveal can pick a low or a high symbol.
2. Stacked reveal. The mystery tiles arrive in stacks on a reel, so one reveal can fill a whole reel with the same symbol.
3. Expanding reveal. A tile that lands grows to cover its reel or a block of positions before it flips.
4. Reveal with a multiplier. The revealed symbol, or the win it makes, carries a multiplier shown in the paytable.

A title can combine two of these. Read the feature list rather than guessing from the artwork.

Mystery symbol vs wild vs scatter

The three are easy to mix up because all of them are special tiles. They do different jobs, and the table shows where each job starts and ends.

Wilds usually do not replace scatters, and a mystery symbol follows whatever rule the game gives the symbol it becomes. The glossary page on the wild symbol meaning in the glossary shows how widely a wild’s behaviour varies between games.

A named example from this site’s data

PG Soft’s Treasures of Aztec is the one title in this site’s data that lists the idea: its feature list includes mystery symbols upgrading to wild, on a 6-reel, 5-row grid with up to 32,400 ways. You can read the full figures on the Treasures of Aztec reference page. Note the wording: the mystery tile is described as upgrading to a wild, which is a different outcome from flipping to a paying picture symbol.

Where to read it on a paytable

Every game states its own version, so the paytable is the only reliable source.

1. Open the game’s info or paytable screen from the menu.
2. Find the symbol page and look for a tile with a question mark or a plain card back.
3. Read the line that says what it can turn into, and whether every tile turns into the same symbol.
4. Check the feature pages for a multiplier or an expanding rule attached to the reveal.

Features that look similar but are not

Two other slice titles show how a studio words a symbol-changing feature without a mystery symbol. Read what PG Soft’s page lists for Pinata Wins: Gold Framed symbols with multipliers up to x100. And read how Pragmatic Play words Sugar Rush 1000: winning spots are marked, and a multiplier starts at x2 and doubles to x1,024 when another win lands on the same spot. Neither studio page calls these mystery symbols, so this site does not either.