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UndeadPrivateer You can find all ten installments of the game posted on NotDoppler as well as Kongregate. There were three spinoffs as well.
Here's the series list:
Submachine (the first game was just called "Submachine" with nothing else on it)
Submachine 2: The Lighthouse
Subbmachine 3: The Loop
Submachine 4: The Lab
Submachine 5: The Root
Submachine 6: The Edge
Submachine 7: The Core
Submachine 8: The Plan
Submachine 9: The Temple
Submachine 10: The Exit
And the three spinoffs were:
Submachine 1: The Basement (a remake of the first Submachine game but with more detail; the rooms are rearranged but the puzzled are identical)
Submachine 0: The Ancient Adventure (a fan-made tribute that was so well done, Skutnik included it in the lineup)
Submachine: FLF (a fan-made collaboration worked on by a group of people)