About $25 to $34 as of 2026-11-09, based on 4 recent eBay sales with a median of $29. Similar ones are listed right now for $22 to $27, but asking prices run higher than what things sell for.
Recent eBay sales: $28 (Tetris DX (Nintendo Game Boy Color, 1998) Cartridge Only - Tested…); $23 (Tetris DX (Nintendo Game Boy Color, 1998) Cartridge Only - Tested…); $30 (Tetris DX Nintendo Game Boy Color GBC, 1998 Cartridge Only Tested…); $30 (Tetris DX (Nintendo GameBoy Color, 1998) Authentic Tested Game…).
Loose cartridge or disc vs. complete in box: the box and manual can add as much as the game itself, so say which you have. Authentic vs. reproduction: popular titles are widely faked. Check the label print, the board inside, and the screws. Region: a US game sells to US buyers. Japanese and PAL copies are a different market and usually sell for less here.
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Guestimates are market estimates from public eBay data at the date shown, not certified appraisals. Prices change; check before you buy or sell. As an eBay Partner, Guestimator may be paid a commission when you buy through links on this page.