Gimmick!, released in Scandinavia as Mr. Gimmick, is a platform video game developed and published by Sunsoft, and originally released in Japan for the Nintendo Entertainment System in 1992. The story follows a small green creature named Yumetaro who was mistakenly given as a toy to a young girl. After the girl's toys come to life and whisk the girl away to another dimension, Yumetaro gives chase to save her. Playing as Yumetaro, the player must maneuver through a variety of levels, using the protagonist's star-shooting power to defeat enemies and progress through the game.

In order for Gimmick! to rival the quality of games on the then-new Super Famicom, director Tomomi Sakai required a large staff and used innovative techniques to create high-quality graphics and sound. The graphics were handled using advanced tileset algorithms which freed processing power so more detailed graphics could be drawn on the screen. The game uses an expanded sound chip which provided more sound channels than a standard Famicom game cartridge. With this special chip, composer Masashi Kageyama was able to create a more advanced score. The soundtrack crosses multiple genres, with Kageyama describing it as a "compilation of game music".

Gimmick! received mixed reviews and a lack of interest at release. Distributors were more interested in games for the new 16-bit systems, so Sakai found difficulty in getting the game localized outside Japan. Sunsoft of America did not approve of the game for a North American release due to its quirky character design. Ultimately, the only distributor that imported the game was Swedish distributor Bergsala, which released it in 1993 for the Nintendo Entertainment System in small quantities across the Scandinavian market. Critics both praised and criticized the game for its difficulty, and some thought the game was designed exclusively for children due to its character design. In retrospective reviews, Gimmick! has received more praise. It was re-released in Japan in 2002 for the PlayStation, and a remake developed by exA-Arcadia was released for the exA-Arcadia arcade system in late 2020. A remaster of the game was released on July 6, 2023, for Nintendo Switch, PlayStation 4, Windows, and Xbox One.

On June 20, 2024, a sequel was announced titled Gimmick! 2. It was released for Nintendo Switch, PlayStation 4, PlayStation 5, Windows, Xbox One, and Xbox Series X/S on September 5th.

Gimmick! is a platform game that places the player in control of a small green creature named Yumetaro. The story begins during an unnamed young girl's birthday. Her father is normally busy with work, but he is able to spend time with her family for the special occasion. Earlier, he had gone to the store to purchase a new toy for his daughter. Yumetaro had been wandering the toy store and became confused when her father came in. He hid with stuffed toys that looked like him, but was picked up by the girl's father. When the girl opens the Yumetaro gift, she is delighted. Yumetaro becomes the girl's favorite, and so her other toys no longer feel loved. One night, the toys come alive and take the girl to another dimension. The only one left is Yumetaro, who follows the toys in search of her.

The player, as Yumetaro, must venture into the alternate dimension to rescue his new owner. The player character can jump and spawn stars above the horn on his head. The star is a central mechanic to the game, being necessary to defeat enemies found while also doubling as a platform, capable of being ridden to reach otherwise inaccessible areas. The player must make their way through six stages and six bosses to complete the game. Once the sixth boss is defeated, it is revealed that the girl is still missing and the game restarts from the beginning. To truly complete Gimmick!, the player must find a hidden area in each stage where a magic item resides. If one can obtain all the magic items without losing every life (i.e. using no continues), a secret stage would appear in which an extra boss must be beaten. Only after this boss is defeated is the game completed in full, with a cutscene showing Yumetaro rescuing his owner and leading her back to the real world.

Gimmick! was conceived by lead designer Tomomi Sakai, who put a variety of ideas into the programming of the game, such as making it in the style of an arcade game, with the gameplay occurring within the upper part of the screen and the score displayed in the lower part. The game may have been developed with a MicroVAX minicomputer, but Sakai claims he could have made the game how he wanted regardless of what equipment was used. In order to rival the quality of Super Famicom games, a large staff was required. He had always thought about developing his own game with Yoshiaki Iwata and Hiroyuki Kagoya, who were involved in designing Blaster Master, a previous Sunsoft title. The two, however, were paid very little for their involvement in making Gimmick!. The characters were designed by Sakai and Kagoya. Sound programmer Naohisa Morota, who had left Sunsoft shortly before development of Gimmick!, would work for Sakai as an "outsourcer".

The process of using the 256 graphics tiles on the NES was handled with special programming techniques. The team streamlined the process by dividing the number of tiles into two groups of 128 and separating them into enemy characters and protagonists. By further dividing the tiles into four groups of 64, they were able to reduce graphical processing and switch out tilesets to use as background cogs and floor animations. Sakai left Sunsoft prior to the game's release, due to his dissatisfaction with the game's opening being rewritten and his name being removed.