penrose section, region or area

[gordonwoodhull]

Penrose pipes is too easy because of the border.

The infinite lazily-generated puzzle is possible, but

• it's a significant engineering and algorithmic challenge
• it would probably be unsatisfying as a game

Another possibility, as suggested by @gereleth in email, is to only require the player to solve the part of a larger puzzle within a region.

That region of the puzzle would need to be connected, so this might require a change to the generator. If any tiles outside the region are generated, they are not used.

"Region" (or section, area, portion - pick one) would be a third topology of grid, along nowrap and wrap.

Visually, the border tiles could fade out to transparent toward the border sides to indicate that those sides don't matter.