The plot in this mod involves Keen rescuing his pet Yorp from the planet Yorphius II. Unfortunately the story text included with the mod is very short and does not explain several details.
This mod, despite being before the time of many utilities and patches, has a stamp of great quality and is one of the most well-respected mods. A multi-page thread on Keen: Modding started in May 2006 was active for multiple months, discussing the level design of the mod. The levels are typically concise, well-planned scenarios and puzzles. KeenRush's style changed somewhat between this mod and Episode Smile. It is one of the small handful of mods to have a boss battle at the end.
If the mod is played 'as-is' from its download the player will hear garbled 'nonsense sounds' when playing the game. This is because the mod does not come with a SOUNDS.CK1 file by default. This causes the game to try and read random garbage from the memory where the sound file should be loaded as real sounds. This won't crash the game, since the sound playing code lacks any way to crash and its memory is tightly controlled, but it can be quite jarring and confusing.
This situation arises because the mod was intended to be copied into an existing Keen 1 folder, overwriting the relevant files there. If this is done no problems will be encountered and this is in fact what the game's README.TXT file asks. However if players are known for anything it's not paying attention to what the modder wants, which is why modern mods are set up to be as difficult as possible to install wrong.
The original version of Yorphius II contained a modified executable, and is thus illegal. When the game was first made, CK1PATCH had just been released. Many people did not understand how to work the program at the time, and as a result the creator directly modified the executable, something that could be considered illegal by the original game authors/publishers. This is not considered much of a crime, as Keen 1 is a shareware game and free to distribute and obtain legally, but is still a concern to some people.
Some time later, Stealthy71088 and Levellass worked together to identify all the modifications made to the executable; they then used CK1PATCH to patch an unmodified copy of KEEN1.EXE and released a legal copy of the mod. Links to the legal copy are included below.
Yorphius II Point Item100 points.
Yorphius II Point Item200 points.
Yorphius II Point Item500 points.
Yorphius II Point Item1,000 points.
Yorphius II Point Item5,000 points.
ActivatorsActivators required to finish the game.
KeycardsKeycards used to unlock doors.
Pogoing allows reaching otherwise inaccessible places.
RawgunFive extra shots.
The levels shown are as they are in the original version:
- 90: Title screenRequired?NoPoints0Ammo0
- Stand-alone story
- Graphics: custom graphics by KeenRush
- Levels: 16 levels, 2 secret levels, 1 worldmap
- Tools used: A.X.E., ModKeen 1.0, Keen Make-Over 2, Paint Shop Pro 7, MSPaint