Removed some excess (left-over) elements. Added portal magnets on certain surfaces where a misaimed portal would be cumbersome. Minor cosmetic finetunings.

Added a room that gently teaches a principle necessary later on in the level. Also added some pipes as decorations.

For some reason, the goo was murky and reflectionless in version 6. Did some minor changes which succeeded in making the water reflective again.

Some architectural changes to discourage a wrong solution. Lots of effort in coercing the antlines to be routed nicely.

Removed an observation room whose window-sill caused a clumsy obstacle during a fling.

Thanks to playtesting, realized it is not obvious to everyone you can put spheres on buttons. So I added a teaching room.

Minor usability improvements: Added a contrasting background for the laser; and a couple of portal magnets.

Minor cosmetic changes.

Initial release.