Name: Tamagotchi Connection (US)/Connexion(EU)/Plus(JP)
Version: 1
Screen: Color background, but anything else is black.
Games: 2
Can connect: To other Tamagotchis of this version/To Tamagotchi Connection/Connexion/Plus Version 2
Can it Pause?: Yes
Extra features: Tamagotchis can play games with eachother, give eachother presents, get married and have children. Special events take place on certain holidays. Tamagotchis enter a sort of "screensaver" mode, where if you don't touch any buttons for a while, you might catch the Tamagotchi taking a bath, brushing its teeth, etc.
Name: Tamagotchi Connection (US)/Connexion(EU)/Plus(JP)
Version: 2
Screen: Color background, but anything else is black.
Games: 3
Can connect: To other Tamagotchis of this version/To Tamagotchi Connection/Connexion/Plus Version 1
Can it Pause?: Yes
Extra features: You can gain Gotchi points by playing games, and when you get enough points you can go to a tamagotchi shop and buy things for your Tamagotchi. There's a TON of characters (more than double of what the version 1 has)...and I think that's about it.
Name: Tamagotchi Ketai
Version: 1
Screen: Color background, but anything else is black.
Games: Not sure
Can connect: to cell phones where you can access games and shops.
Can it pause?: I believe so
Extra features: I'm not too sure about how the Ketai works. I know it's specifically made for connecting to a cell phone, but as far as I know it only really works in Japan.
Name: Tamagotchi Mini
Version: 1
Screen: Color background, but anything else is black
Games: Not sure
Can connect: I don't think it can connect to anything.
Can it pause?: Probably
Extra Features: I don't think there's really any extra features...it's just really tiny. Maybe a 3rd of the size of the Tamagotchi Connection.