Thanks!
BTW, as for the teleportation trick - both Antichamber and AAAAXY could not really have been done with the teleportation trick alone, as objects (e.g. Antichamber’s matter gun blocks) remain available when going through a portal. In a few places a player can even clearly notice that the game isn’t just teleporting those blocks, too.
However, the first part of the game would entirely have been possible with just seamless teleportation.
BTW, Super Mario Bros. 1 is probably one of the first games with impossible spaces, in two ways, so it may too be worth mentioning:
- Pipes are not connected in a way consistent with layout on both sides (but arguably this could be understood as a long twisted pipe one just doesn’t see, so this may not really count - after all, maybe pipes are just teleporters).
- Levels 4-4 and 7-4 are “puzzles” where one has to pick an upper/lower path, and picking the wrong path seamlessly transports one to the start of the “puzzle”. This appears to be done by seamless teleportation and even in a bad way, as Firebar objects suddenly stop working when scrolling past the “portal”.