Darkroom Exposure

Twenty fixed paylines on a 6×4 board, each one evaluated from the leftmost reel and from the rightmost. Three or more from either end pays — every line is effectively two.

The board is three glass negatives on rails. A win draws its crimson line, the plate beneath it slides one cell, the symbols travel with it and the board is re-read. Symbols that end up aligned across a plate boundary snap into focus and are registered — and in the base game a registration pays on the spot, its symbol's three-of-a-kind value, before the plates move again. The camera registers too: across a rail it stands in for the paying symbol facing it. In the Red Room the marks are banked instead, for the Final Exposure.

A single spirit landing anywhere in a reel's window expands over the whole column: a full wild reel with a multiplier badge of ×2, ×3, ×5 or ×8. Wins passing through her are multiplied, several spirit reels multiply together, and her reel is held while the plates slide around it.

Three or more photographs open the Red Room, where the spirit haunts — she stays for the rest of the round — and every win carries the room's multiplier. Six perfect registrations, the same symbol aligned across all three plates, trigger the Final Exposure: the shutter fires and every registered symbol pays again — each bracket paying the symbol it photographed, whatever has slid beneath it since.