Jet Set Willy: Role Reversal is the fifth JSW game released by Sendy (Alex Cornhill). It marks Sendy's comeback onto the MM/JSW scene after the better part of two decades since her previous gamma release. The game re-imagines the scenario of Jet Set Willy, with the roles reversed. The player plays as Maria, the Housekeeper, who must tidy up Willy's mansion (and for some reason, the surrounding area) before he will let her go to sleep.

The game's history goes back to 2003, when Vidar Eriksen (Erix1) made it possible for Sendy to create a JSW game using the extensions to the JSW48 game engine he had applied in his then recently released game Maria vs. Some Bastards. Erix1 sent Sendy a special program he had written, called Hackulator, and Sendy used it, along with JSWED, to create this new game in which Maria is made to tidy the house by Willy. She announced the start of the creation process in April 2003, saying that the game "is (a) done in a classical (rather than abstract) style (which is a departure and challenge to me), and (b) very atmospheric and similar in layout to JSW". In March 2004, Sendy uploaded a beta file of Jet Set Willy: Role Reversal to the MM/JSW Yahoo Group! Later on, the game was supposed to be released shortly, but the gamma-release never materialised.

Sendy restarted work on the game, using the 2004 beta file, in early 2023. Daniel Gromann contributed some custom code, including the title and loading screens, to the final version. The game was finally released in March 2023.

According to the author, Jet Set Willy: Role Reversal "is a hard game to complete, perhaps a bit harder than regular Jet Set Willy, but beginners should be able to see most of the screens without too much trouble".

Jet Set Willy: Role Reversal features:

- 256 items to collect;

- A custom-made title screen;

- Many features that are absent from the classic JSW48 game engine,

such as enhanced graphics, crumbling cells, horizontal lifts,

unidirectional guardians, switches and many other enhancements;

- An extra life awarded for every 32 items collected.