The Friends of Sodor was a Game Boy Color game developed and published by Tamsoft that was released exclusively in Japan in 2001.
- Donald and Douglas
- Bill and Ben
The player controls Thomas as they explore the different parts of Sodor. Along riding the track, the player comes across empty spaces where they have to pick the right track piece which fits. As they further explore, the player will meet different characters who will talk with Thomas or might give him a task. The tasks range from a number of mini-games which once completed allow the player to further continue. If the player fails, they must restart the level. There are four levels to start off (Which are the farm, the hills, the docks and the quarry) which the player must complete each one in order. A final level (Which is the town) is unlocked in the end. Other characters encountered are hidden which Thomas must use his whistle to reveal them.
The player can unlock small biographies of each character that they encounter.
- There could have been a "Thomas the Tank Engine & Friends" game for the original Game Boy developed by Tiertex and published by THQ in 1998, despite the unreleased NES version. It would have been completed in 1993 but did not get released until 1998.