It's no secret that Gakken TLR camera is Doesn't have the shoe for flash. Putting one on it isn't that hard!
I chose the left side of the camera, as on the right side of the trigger shutter and the flash would have prevented it (although even here the shoe may prevent the tripod to be useful, but I do not think I’ll shoot with a tripod on this camera). Since it’s just a pseudo-hotshoe and not really in sync with the shutter, it’s better press the test flash button while taking a shot.
Now I hope that someone finds a way to attach a real hot shoe :) Good luck!