''The Thor Trilogy'' AKA ''Caves of Thor'' is a maze video game published in 1989 by Apogee Software. It was developed by Todd Replogle under the Scenario Software name.
The game places the player trapped within the Caves of Thor. The object of the game is to locate three missing items scattered throughout the place. The missing items are the Female-item, the Heart-item and the Male-item. The game's interface, gameplay and graphics are similar to a previous Apogee game, ''Kingdom of Kroz'', and to the game ''ZZT''.
The game was originally distributed as shareware. It consists of three volumes, with only the first volume distributed as shareware, and the rest available commercially. The volumes are:
* Volume I: Caves of Thor
* Volume II: Realm of Thor
* Volume III: Thor's Revenge
The source code of the game used to be available for U$195.00 (in 1990) directly from Todd Replogle. The game was discontinued, and it was later re-released as freeware by Apogee in December 2005.
The game includes PC speaker renditions of various classical music pieces, including Flight of the Bumblebee by Rimsky-Korsakov, two preludes from the Well-Tempered Clavier by J.S. Bach, and Solfeggietto by C.P.E. Bach.
!!This VideoGame contains examples of:
* EpisodicGame: There are three episodes to the game.
* FreewareGames: This game became freeware in December 2005.
* OneHitPointWonder: Averted, the player character has 200 points of health.