CurseForge · Minecraft mod
Under Aperture
The Future is Here! And it’s Under the Earth’s crust...
Quick answer
Which Under Aperture release should I use?
Under Aperture under_aperture-1.0.3.jar targets 1.20.1 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 1 required mods have matching files.
Where it goes
Is Under Aperture required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Under Aperture under_aperture-1.0.3.jar need?
under_aperture-1.0.3.jar. Change the file and its required mods may change too.
Install GeckoLib first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Under Aperture without breaking your instance.
Built for Under Aperture under_aperture-1.0.3.jar. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use under_aperture-1.0.3.jar. It targets 1.20.1 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install GeckoLib first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside under_aperture-1.0.3.jar. It opens that exact file at the source.
About this project
What does Under Aperture add?
The Future is Here! And it's Under the Earth's Crust... This is a Heavy WIP Portal 2 Inspired Mod! Born from the fact that you can never find any good up to date Portal mods that are actually playable on Forge or 1.20.1! This mod is planned to contain a variety of things, although please take it with a grain of salt! As this is generally my first mod so it may contain bugs or update a bit slow! Feedback is greatly appreciated!
Currently Implemented Features;
- 3 White Panel Blocks, 1 which is a 1x2 Panel Multiblock
- Animated Chamberlock Door that is powerable by redstone
- Animated 1500 Megawatt Supercolliding Super Button that outputs a redstone signal on Player contact.
- PotatOS (experimental, may speak to you)
- 2 Flat Glass Blocks, although they are a bit simple and may be updated later
- The Weighted Cube (default keybind for picking up is B)
- Weighted Cube Dropper which is activated via redstone
- All in-game items and blocks are currently survival friendly and should be craftable
Planned Features/Roadmap;
Portal 2 Materials such as Walls and Floors of varying types and colors
Portal 2 Chamberlock Doors
1500 Megawatt Supercolliding Super Button
Weighted Storage Cube
Dropper
The Material Emancipation Grill
(Possibly) The Handheld Portal Device
Redstone Antlines that are placable on walls and ceilings.
PotatOS (sentient)
(Possibly) GLADOS Mob (sentient)
Turret Mob
Asbestos?!
And hopefully more!

Project description from CurseForge.
Pick your setup
Under Aperture by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.20.1
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Under Aperture versions and loaders
under_aperture-1.0.3.jar
portalmod_unknowndeveloper-1.0.3.jar
20 Jan 2026
under_aperture-1.0.2.jar
portalmod_unknowndeveloper-1.0.2.jar
3 Jan 2026
under_aperture-1.0.1.jar
portalmod_unknowndeveloper-1.0.0.jar
1 Jan 2026
Looking for an older file? The official CurseForge project page is in Resources.