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Pentomino tiling on wrap-around 5x5 grids

Puzzling Asked on February 27, 2021

It is known that P pentominoes cannot tile a 5×5 square board.

Q1: If the east and west edges of the 5×5 square board are "wrapping around" (if you move a piece through one of the edges, the part appears on the opposite edge), can you tile it with P pentominoes?

Q2: In addition to the above, the north and south edges are also wrapping around (thus forming a toroidal surface). Can you tile it with P pentominoes?

Q3: Identify all distinct pentominoes that can tile the 5×5 toroidal board.

2 Answers

Q1: Here is a perhaps not elegant but at least not super ugly proof that it is

Q3 (includes Q2): These are tilings for

Correct answer by Paul Panzer on February 27, 2021

Paul did the hard parts, so here's the answer to Q1:

(EDIT: while I was creating the pretty but oh so unnecessary picture, Paul edited his answer to include a solution to Q1 too. Mine seems somewhat more straightforward, so I'm leaving it up for now at least.)

Answered by Bass on February 27, 2021

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