Ninjajar! is a 2D platform game that draws inspiration from Alex Kidd in Miracle World. Ninjajar wants to take a holiday with his girlfriend on the Beaches of Pepinoni, but when he goes to her village he discovers she has been kidnapped by a monkey. He starts the pursuit to find her back.
The game consists of a large amount of single-screen environments connected horizontally and vertically to offer exploration. There are villages, caves, underwater sequences and so on. Ninjajar does a lot of platforming. He can jump and punch to take out enemies or to destroy blocks, for instance to create a passage or a platform with elements of environment based puzzle-solving. These puzzles also involve levers and there are many secret rooms to be discovered. The game contains several items that have different uses. Ninjajar can pick up these items and they are stored in a "Carry" portion of the screen. A large amount of interaction is possible. He can talk to people and animals, collect coins, read signs, enter shops to buy new items and so on. The game is split up in several levels and a password is providing after completing one. Nine lives are provided at the start of the game.
Next to the free download release there was a crowdfunded release with the Spectrum 128K in cassette format along with a cover and instructions. Based on the tier different extras were provided, such as having your name listed in the credits, A T-shirt, or becoming a character in the game to replace Amador the Lumberjack, the Ninjajar guide.