Gem Stack

Turning rough stones into jewellery on a running track is the premise of Gem Stack, a hyper-casual action game from Rollic Games. It borrows the familiar runner format, where you steer along a course and collect as you go, and gives it a small crafting twist.

As you move forward you pick up raw gems and stack them, then process them on the way: breaking, cutting and polishing each one so it is worth more to the customers waiting at the end. Obstacles along the route knock pieces off the stack, so the task minute to minute is weaving around hazards while keeping as many stones as possible. Money earned goes into upgrades that increase what each run pays out. The store description is brief, so that loop of collecting, refining and upgrading is essentially the whole game.

Opinion is divided. Gem Stack scores 3.8 from 32,306 ratings; 56% are five stars, but 18% are one star, a sizeable unhappy minority. It has passed 10,000,000+ installs. The game is free with ads, and there is an in-app purchase listed at $2.99 per item. It was updated on 2026-09-17, needs Android 7.1 or newer and is rated Everyone. We list a single version, 4.3.2, and no file size is recorded for it.

It suits anyone after a quick, simple distraction between other things. Players looking for depth, or who have little patience for ad breaks in short-session games, are likely to tire of it quickly. It works best as a few minutes of light fun rather than something to sink an evening into.