Unlike dungeon defender, SK's play area is highly limited and there are very few candidate surfaces where this could work. They would need to design the level around the concept, just to keep people from trapping themselves on accident (or on purpose).

Also The concepts, theory, design, and color schemes related to the Aperture Science Handheld Portal Device is the sole property of Aperture Science Inc. Any person, persons, AI, mechanical device or sentient liquid found to be in possession of materials and/or thoughts related to Aperture Science property, without proper authorization, will be punished as per the Employee Readjustment guidelines in Chapter 37 of the Aperture Science Enrichment Center employee handbook. Penalties include, but are not limited to, loss of cake privileges, loss of bathroom privileges, confinement to living quarters, confinement to work area, mandatory employee and test subject orientation, mandatory employee and test subject reeducation, mandatory employee and test subject termination, coffee duty, loss of hallway privliges, termination of employment, and loss of authorization for use of Enrichment center facility resources to support critical bodily functions.

If you are not currently in the employ of Aperture Science Inc or its affiliated companies, you will be offered a position with the Enrichment center as an authorized test subject, following an optional background and criminal record check as per normal hiring procedures. If you do not qualify as a test subject, you will be offered the default position of entry level test subject.