BOB.jar
by StendeSton
BOB.jar is a Forge cursed mod for Minecraft 1.20.1 that makes the game harder and more annoying on purpose, by changing how players move, how blocks behave and how mobs act.
What it does
Players who install BOB.jar find the vanilla experience deliberately worsened. Movement is hindered, mobs can turn into creepers, and some blocks place or explode and break unexpectedly. Players can also randomly overheat in the Nether or catch frostbite in the End, with armour affected in the process. Certain items cause corruption, and some special items can only be crafted under these conditions.
The mod is published for Forge only and is limited to the 1.20.1 game version. It runs on client and server, so a server and every player that joins it need the mod. The author states it is still in early development, so bugs and unintended behaviour should be expected. Its author recommends singleplayer play, and advises against running it on servers where others might be annoyed. The files are released under All rights reserved, so the code is not open source.
Key features
Hindered movement
Player movement is restricted in ways vanilla Minecraft does not apply, changing how the character gets around the world.
Corruption items
Specific items spread corruption and alter the world, and certain special items are craftable only through these mechanics.
Unstable blocks
Blocks can place themselves unexpectedly, explode and break, making building in the mod's conditions unpredictable.
Environmental hazards
Players randomly overheat in the Nether and receive frostbite in the End, with armour affected by these effects.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: BOB.jar suits players who want a cursed, frustrating variant of Minecraft for singleplayer use. Because the author advises against server use and warns about bugs, it is not intended for multiplayer servers or for players who expect a stable experience.
How it compares
[Bob's] Better Prime is a Forge mod for 1.20.1 that works on either side, and neither side needs it. It is released under All rights reserved, so it is not open source. FriendlyFriend is also a Forge mod for 1.20.1, released under All rights reserved, but it is a client and server mod, so both the server and every player need it. LittleWarprince Stuff is a client and server Forge mod for 1.20.1 under All rights reserved, not open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| BOB.jar | Forge | 1.20.1 | Client and server | 2025-03-09 |
| [Bob's] Better Prime | Forge | 1.20.1 | Client or server, optional | 2025-04-24 |
| FriendlyFriend | Forge | 1.20.1 | Client and server | 2024-03-02 |
| LittleWarprince Stuff | Forge | 1.20.1 | Client and server | 2026-08-03 |
Questions
Does BOB.jar need to be installed on the server?
Which loader does BOB.jar support?
Is it safe to use BOB.jar on a multiplayer server?
In the catalog
BOB.jar is one of 7,555 Cursed mods on ModsFinder, and one of 3,426 Cursed mods for Forge. 34,764 mods support Minecraft 1.20.1.
More from StendeSton
Similar mods
What the author says
This mod is purely made to make your minecraft experience worse! Inspired by "GREG.jar" by DiffyMC. This mod makes your life worse in almost every way, but don't worry, with certain items you can craft special items to get back to vanilla (aka just like, the game not being rly annoying)!
Official listing
- Modrinth page
- modrinth.com/mod/bob.jar
- Owner
- StendeSton
- Published
- 2025-03-08
- Updated on Modrinth
- 2025-03-09
- Facts verified
- 2026-10-15