Solomon's Key

The player, controlling a sorcerer known only as Dana, must overcome unlimited enemy spawning, challenging level designs, a countdown timer, instant death from any physical contact with enemies, and limited ways to dispatch enemies.

Dana is sent to retrieve Solomon's Key to restore the world to light from demons that were accidentally released. The object of the game is to advance through the 50 rooms of "Constellation Space" by acquiring a key to the door that leads to the next room before a timer runs out. The game incorporates elements of the platform shooter genre. Dana can run, jump, create or destroy orange blocks adjacent to him, and cast fireballs to destroy demons.

Solomon's Key was designed by Michitaka Tsuruta, who took inspiration from Lode Runner and added the ability to both destroy and create tiles. The initial game design leaned towards being more of an action title until Tsuruta's boss at Tecmo, Kazutoshi Ueda, suggested it incorporate puzzle elements. Tsuruta took inspiration from Greek mythology as well as the film Jason and the Argonauts for the visual aesthetic of the game. The title of the game itself came from the sales manager, Harano, after one of the developers explained that the star-like symbol throughout the levels was the seal of Solomon and that there was a book called the Key of Solomon. Harano stated that he liked it, at which point it got its title.

In Japan, Game Machine listed Solomon's Key as the 18th most successful table arcade unit of August 1986. Solomon's Key sold 300,000 copies in Japan.

In 1992, a prequel was released for the NES named Solomon's Key 2 (called Fire 'n Ice in North America).

Monster Rancher Explorer (Solomon in Japan), also released by Tecmo, features the same gameplay but with Monster Rancher characters.