John Hancock has collected about 10,000 video games. His garage-turned-game-room bursts at the seams with cartridges, discs, boxes, cases, instruction booklets, bookcases, posters, cardboard boxes resembling treasure chests that hold odds and ends. All eras are represented, as are the complete libraries for over 24 game consoles. Pong machines, those earliest of consoles, dominate an entire bookcase. Nintendo and Sega cartridges take up entire walls. Opposite walls. John wouldn’t want Mario and Sonic trading fisticuffs when he isn’t looking.