Katmandu Gold Slot by ELK Studios

Two buy bonus tiers, and the gap between them says a lot about this game. The standard option at 100x triggers free drops the normal way - 3 to 6 scatters, 10 to 25 drops. The Super Bonus at 500x does the same thing but starts your persistent multiplier at x10 instead of x1. 500x is a lot to put on a single trigger, but that x10 head start means every bonus symbol during the round pushes you into double-digit multipliers fast. And the multiplier never resets. It climbs with each bonus symbol that lands across all your free drops and stays there through retrigggers. That never drops.

The grid starts at 6 reels, 4 rows, 4,096 ways. Each cascade win clears its symbols and drops new ones in - standard avalanche - but also adds a row on top. Chain enough wins and you climb to 5 rows, 6, 7, 8, eventually 9 rows and 531,441 ways. Free drops reset the grid back to 6x4 on every spin, so you rebuild that expansion from scratch each time. Symbols come in four sizes - 1x1, 2x2 Super, 3x3 Mega, and 4x4 Epic - and those oversized symbols count as clusters of their smaller equivalent. A 4x4 on a 6-reel grid covers a serious chunk of the visible area. The Ice Climber is the unique piece: land two or more and each one replaces itself plus everything above it with fresh paying symbols. If one sits on row 8, the game opens a 9th row to make room. The 2x2 version also replaces wilds in its path, while the 1x1 leaves wilds untouched. Expanding Win symbols work alongside all of this, spreading in their arrow direction when they form part of a win.

Snowy Himalayan peaks behind the grid, stone temple architecture, Tibetan prayer flags strung across the top. Premium symbols are a yin-yang medallion, golden dragon mask, explorer portrait, and a snow leopard. Fifth entry in the ELK Gold series after Ecuador, Tahiti, Voodoo, and Black River - all sharing the avalanche-plus-expanding-grid framework. Katmandu X came later as a direct sequel but switched to cluster pays on a 6x6, a completely different system. If the expanding ways layout is what you want from the Katmandu branch, this is still the one.