Subscribe to download
Penrose 09: Recursion Principle

Testing Elements: Surface Division Field, Thermal Discouragement Beam, Fizzler, Tractor Beam
Difficulty: Hard
Play Time: ~0.5-1.5 hours
Version: 1.0.1

Aperture Science Southern District once again invites you to try your hand at this special testing track. This map is sure to test your skills with Surface Division Fields! You'll love the beautiful outdoor environments.

There are also some secrets to be found, good luck!

If you find any bugs let me know in the bug discussion. Have fun playing!

Thank you to my playtesters for helping me find the many many bugs:
• Mikeastro
• Otani
• CrimsonError
• Yan
• Soup Store

Thank you to the following for custom assets used in this map:
• TeamSpen210 - Various scripts
• 𝓞𝓴𝓽𝓸𝓬𝓮𝓷𝓽𝓲𝓵𝓵𝓲𝓸𝓷#4623 - HD cubes v2
• Kazi#2712 - aperture vending machine
• Hambrix#8136 - Working office clock
• Wii2#9999 - Reversible tractor beam model & texture
• Mister Smirnov#8888 - aperture camera model
• Valla-Chan#4497 - portal 2 file cabinet skins/variants
• Ada#1825 - 1980s file box variants
• fourthreaper - division field textures and models
• HugoBDesigner - laser ridge textures, indicator light rope
• Frosti - laser generator model

Special thank you to TotesMaggots, whose map Springtime heavily inspired Penrose 09.

This map uses *a lot* of custom assets, and it's hard to keep track of them all. If you notice your asset in the map and were not credited, please message me.

Note from the author:

This map took well over 450 hours to create over about 6 months. It pushes the limits of what source engine is capable of, and as such it may not run well on lower end computers. A large chunk of those 450 hours were spent doing optimizations, so I can confidently say there is nothing more I could do to optimize the map further.

The linked_portal_door entity that this and other Penrose maps use has an incredible amount of bugs. It's extremely time consuming to work around all the bugs, and some of them cannot be worked around. Due to this, and other difficulties working with the base source engine, this will be the last Penrose map for the Portal 2 base game. Any potential future Penrose maps will be developed for Portal 2: Community Edition.