Are old Game Boy games still going up in value?

Yes, but not across the board. Old Game Boy games are no longer in a simple, steady upward run; the market is more mixed now.

In general:

• Common loose cartridges are usually the most stable and often change slowly rather than surging.
• Popular titles from Nintendo and especially Pokémon tend to stay in demand and hold value well.
• Complete-in-box copies and genuinely rare games can still rise if condition is strong and supply stays tight.

So the short answer is: some old Game Boy games are still going up in value, but many are mostly steady now, and the biggest gains tend to be in rarer, cleaner, or boxed copies rather than everyday loose carts.

If you’re buying or selling, check recent sold listings rather than asking prices, since values can vary a lot by condition, edition, and whether the game is authentic. Reproductions are also a real issue with high-value cartridges, especially Pokémon and sought-after RPGs.