Everything '90s is new again, and the Tamagotchi is back for its 20th anniversary. These $25 keychains contain tiny digital "friends" that you keep alive with periodic button pushing. I had one when I was a kid, but I gave mine to a girl after the school bully threw her's out the window of a moving bus. Moving into the modern world of mindless button-pushing games, a basic, number-based paper-clip manufacturing game was all over the Web this week. The director of NYU's Game Center, Frank Lantz, designed the game to prey on people who love seeing numbers move continuously higher.