GOG release missing feature
In order to upload one's best scores to the online leaderboard, online activation done by entering a serial product is needed. No serial product comes with the GOG download release, and the leadeboard is not accessible.
Steam release activation process
Users getting the game from Steam have to register a game-specific account in order to complete the registration of the game, required to access online leaderboard.
The look of the Amber Moon table got changed in the first German Windows release to promote the game Two Worlds