The background on the acutal tamagotchi...on the screen is also just a square piece of cardboard. you can take your tamagotchi apart with a screwdriver and change cards to get a different background or you can make your own.
I have a Jinsei and a v4 tamagotchi and they connected before but now they won't connect for some reason. I tried connecting them by selecting v4 and jinsei together and selecting other together, etc. but they just won't connect. I took them apart and everything seems to be connected and nothing...