all sticks (joins) are 5 long, so they form a 3x4x5 right angle triangle these stay in place,

but only one stick can be placed straight,

also each turn the straight stick can be removed and replayed

p.s. don't rename it as TWIXT Pythagorean Prime ……. that would be most confusing

Back in the 70's we would play a game on a 36 x 36 board and had a few super moves that could only be played once in a game.  2x2 and 3x1 for example.  Or the “iron bullet” move where you could replace a stand alone peg with your own.