Fashion Merge is a Suika merge game with dress-up and makeover elements. A teenage girl needs the player to develop fashions, accessories and makeup products by merging basic related objects to create new ones. She also needs their help with trying out different hairstyles, eye and lip makeup colors, and jewelry pieces.
On a dressing area screen, the game displays a container bordered with a light frame and a fashion-evolution bar. The latter tracks the development of new products, including lipstick tubes, perfume bottles, hair combs, high-heeled shoes, pearl necklaces and wide-brimmed hats. The game requires the player to drop and merge matching pairs of these objects in the container. It gauges their progress with an upper-left progress bar.
After the player reaches each goal and earns enough coins, they change the girl's appearance with products found on a bedroom screen. They use left-side category buttons to review and select the makeover options. They can switch her appearance back to the default look at any time with a lower-left refresh button.
Fashion Merge offers the player an opportunity to continue playing after a loss. They merely need to view an ad video. If they decide to start over, the girl keeps her last new look, and the player keeps any remaining previously earned coins.