''Jet Set Willy'' is a computer game originally released in 1984. It was released first on the UsefulNotes/ZXSpectrum, but was later released on [[StealthPun multiple platforms]]. It is a sequel to ''ManicMiner''. The plot is that Willy had bought his new house with the money from the previous game, but it is unexplored and full of what are probably [[MadScientist the previous owner's]] experiments. After a celebratory party, the place is chaos and his housekeeper Maria won't let him go to bed until he sorts it out. Willy must tidy up the mansion so he can get some much needed sleep.

With regard to gameplay, ''Jet Set Willy'' is one of the first multi-room (''ManicMiner'' had single room levels) GottaCollectThemAll [[PlatformGame Platform Games]]. There is a sequel, ''Jet Set Willy 2: The Final Frontier'', which is an extended version of the original (spawned as a result of [[UsefulNotes/SoftwarePorting porting]] to the UsefulNotes/AmstradCPC and back again), with the unwinnable condition fixed.

A very faithful Java version can be played [[http://www.darnkitty.com/jsw/ here]].

There is a user-made add-on for the freeware game ''RocksNDiamonds'' called ''Super Jetset Wily Bros 3'', the level being an experiment in platforming.

Not to be confused with ''VideoGame/JetSetRadio'', an unrelated game. Or something involving [[Franchise/MegaMan Dr. Wily]].

!!''Jet Set Willy'' contains these tropes:
* CopyProtection: The game came with a sheet of codes. You would look up the line letter and column number and type in the colour that appeared there. Repeat three times to get the game to start. (This has been disabled on the versions you can get on emulators now.)
* CycleOfHurting: In the first game, when you died, you started your new life where you entered the current room. Unfortunately, if you had just fallen to your death from the room above, prepare to watch helplessly as every single one of your remaining lives goes splat.
** The sequel would restart you on the last solid surface you were on. Which was arguably worse, since half the time you would repeatedly respawn on top of a monster. Hello, RageQuit!
* DeadEndRoom: "Entrance To Hades". In [=JSW2=], also "Water Supply".
* TheDevTeamThinksOfEverything: In ''Jet Set Willy 2: The Final Frontier'', there is a room called ''Cheat!'' that leads to an island (you can get to the island by sailing a boat there as well). You can go through ''Cheat!'' only if you have hacked the game and put in an invincibility cheat.
* EasterEgg: There are inbuilt cheat codes in both games.
** According to WordOfGod, the reason that the Cartography Room was one of the rooms added to the UsefulNotes/AmstradCPC [[UsefulNotes/SoftwarePorting port]] is because the code has a built-in teleport cheat routine involving this room. (In the released version, it was disabled but not removed -- it was deliberately left in for fans to find and enable, which requires just three [=POKEs=].) The ZX Spectrum [=JSW2=] also contains this feature.
* EccentricMillionaire: The person who owned the mansion before Willy.
* GameBreakingBug: The first ''Jet Set Willy'' game contained a bug that made it unwinnable (for the geeky among you, on the Spectrum version, it was one of the earliest examples of what is now known as a buffer overflow error). Notable is the fact that half the versions of ''Jet Set Willy'' released were unwinnable! The second game fixed it, but has its own problems due to that fix. See the NintendoHard page for details.
* GettingCrapPastTheRadar: See MythologyGag.
* GottaCollectThemAll: There are artifacts flashing through all the colours the spectrum could handle, you have collect all of them. In the sequel, you go to the moon, a desert island, and the depths of Hell - although this time, you don't quite need all of them (150 of 175 will do).
* HereWeGoAgain: At the end of [=JSW2=], Willy ends up in "The Central Cavern" -- the first level of ''VideoGame/ManicMiner''
* [[invoked]]IdiotPlot: If Willy had just fired Maria when she went on strike, then hired another housekeeper (and perhaps a heavy-duty cleaning firm), the entire plot would never have happened.
* InconvenientlyPlacedConveyorBelt: This forces you to walk down it, rather than dragging you as in other games. (With care, it's sometimes possible to traverse them against the flow.)
** ''Star Drive: Early Brick Version'' in [=JSW2=] takes it UpToEleven. Pretty much every single platform in the room is a conveyor - and until you step on them, you can't tell which way they're going to take you.
* MinusWorld: In the original, jumping up from "The Watch Tower" leads to "The Off Licence" despite this being nowhere near. (In [=JSW2=] it leads to the "Rocket Room".) This is to do with the numbers used for each room (The Off Licence is room 0, so it is a default room when one isn't specified.)
* MissionPackSequel: Even more so, since ''Jet Set Willy 2'' isn't just similar in style, it's an expanded version of its predecessor including all the original rooms.
* MythologyGag: The room ''Oh $#!+! The Central Cavern'' in ''Jet Set Willy 2'' refers to the first level of ''Manic Miner''.
* NintendoHard: Hacks of the game are so hard you have to exploit GoodBadBugs to complete them. Even though ''Jet Set Willy 2'' is completable, it is still a very hard game, requiring pixel-perfect jumping, and you only have eight lives (no extra lives in this game).
* OneHitPointWonder: Falling from too high or contact with any hazard will cause you to lose a life.
* PopculturalOsmosis: The first movement of Beethoven's "Moonlight Sonata" is the title music.
* PlatformHell: One of the earliest examples of this.
* PressStartToGameOver: In the second game, the toilet you start next to is a DeathTrap.
* RespawnOnTheSpot: Sometimes in harm's way.
* ShoutOut:
** "We Must Perform a Quirkafleeg" is a shout-out to the comic strip ''[[ComicBook/TheFabulousFurryFreakBrothers Fat Freddy' s Cat]]'', where it is a bizarre ritual a tourist performs in a foreign country upon seeing dead furry animals. Also, the Game Over scene is [[Series/MontyPythonsFlyingCircus a giant foot coming down and crushing you]].
** And don't forget the Emergency Power Generator, which consists of [[{{Music/Animals}} a flying pig above a miniature indoor Battersea Power Station]].
** And in ''[=JSW2=]'', you can fly a rocket into space. Complete the Cartography Room, and you'll note that the rooms making up the space area form a shape that looks suspiciously like the [[Franchise/StarTrek Enterprise]]. (One of the first rooms is called ''NCC 1501''; along and up a bit is ''[[Recap/StarTrekS2E15TheTroubleWithTribbles The TROUBLE with TRIBBLES is...]]''.)
** ''[=JSW2=]'' also had (amongst the first few rooms entered) "Macaroni Ted" (referencing ''VideoGame/TechnicianTed'', whose authors worked at Marconi) and "Dumb Waiter" (a TakeThat to Imagine's ''WackyWaiter''). It even had a ShoutOut to [[ManicMiner the first game in the series]], in "Down T' Pit". It also has [[Series/StarTrekTheOriginalSeries "Beam me Down Spotty"]] leading to a planet surface or to the Bathroom, and [[BeamMeUpScotty "Beam me Up Spotty"]] (the last room of the planet) leading back to "Beam me Down Spotty".
** One of the space rooms ("Loony Jet Set") is a tribute to ''VideoGame/{{Jetpac}}''; and slightly further along, "Eggoids" is the same for their ''VideoGame/LunarJetman''.
** And just above "Entrance To Hades", you'll find "[[Music/{{ACDC}} Highway to Hell]]".
** "I'm sure I've seen this before.../Rescue Esmerelda" is a tribute to ''VideoGame/{{Hunchback}}''.
* UsefulNotes/SoftwarePorting: The game has been ported to a lot of systems, most versions having a different theme tune.
* SymbolSwearing: See MythologyGag.
* TakeThat: The leftmost of the rooftop rooms is called Nomen Luni, a parody of Imagine Software's motto [[PretentiousLatinMotto "Nomen Ludi"]] ("the name of the game"). This room and the room below together represent the aeroplane from Imagine's ''Zzoom'', which apparently has crashed on the roof.
* UnwinnableByDesign: ''[=JSW2=]'' has a nasty trap for those exploring the game; if you find yourself in "Down T' Pit" and fall through the hole in the floor, you will find yourself in "Water Supply" from which there is no way back up...
* UnwinnableByMistake: See GameBreakingBug. Also, in ''[=JSW2=]''[='=]s "The Hole With No Name", it's possible to jump left into the wrong part of "secret passage", thereby landing on top of the passage. Oops, time to reset the game.