Solstice: The Quest for the Staff of Demnos is a puzzle-oriented video game for the Nintendo Entertainment System created by Software Creations and heavily influenced by Ultimate Play the Game's Knight Lore and Pentagram. Its theme music was scored by composer Tim Follin.

The player controls a wizard named Shadax and explores a maze of isometric rooms and gardens of the fortress Kastlerock to find the six pieces of the Staff of Demnos, the only weapon that can defeat Morbius. The non-linear adventure game does not impose a fixed sequence of play, although Shadax must collect various keys, depress "plungers", and set off bombs before he can enter parts of the dungeon. Shadax can jump, pick up objects, and use various potions, and must generally avoid touching monsters to survive.

By solving a room's puzzle, the player obtains a necessary item or proceeds to another room. The player must avoid pitfalls, spiked floors, and monsters (such as slimes and trolls). Some monsters are used to solve puzzles. Shadax can also simultaneously jump off a falling block and pick it up to use again. In some rooms he must do this repeatedly to cross a gap.