The Mystery of Time and Space (MOTAS)
Description: The grandaddy of all online escape games. Has aged well after being around on the internet for well over a decade.
Difficulty: Easy-Hard depending on the level you're on.
Submachine Universe (Submachine Network Exploration Experience)
Description: A playable expanded universe of Mateusz Skutnik's popular Submachine series, deemed to be an MSO (Massively Singleplayer Online). Has no ending, for it's purely for the sake of exploration and not about beating the game.
Difficulty: Moderate
Description: The early beta of Submachine 2: The Lighthouse.
Difficulty: Easy
Description: A point and click game that's about escaping a group of islands that you're stranding on.
Difficulty: Moderate
Description: After escaping from the island in the original game, you're stuck on a new group of islands.
Difficulty: Hard
Description: Point and click game in which you must solve all the puzzles to win.
Difficulty: Moderate
Description: Just like its predecessor, you must solve all the puzzles to win.
Difficulty: Hard
Description: Again, you must solve all the puzzles to win.
Difficulty: Moderate
Description: The towb's water route is broken, and you have to go on a quest to fix it.
Difficulty: Moderate
Description: After crash-landing on a planet, you must learn the language of the locals and communicate with them in order to fix your ship to escape.
Difficulty: Easy
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If you get stuck with any of these games, let me know and I'll try to help.