"Play games only one hour a day!" (Takahashi Meijin)
To be honest: I've done a lot of detective game reviews here, but even I had not expected to do a Game Boy game here.
I think this might even be the very first game based on the Kindaichi Shounen no Jikenbo series. There have been great Kindaichi Shounen games in the past (particularly the one where you play the murderer and must outwit the young detective), but also bad ones: the most recent game in particular was horrible (the crossover with Detective Conan was fun, by the way). The Game Boy (Color) is of course a fairly limited system, but luckily, that is something that seldom really hinders adventure games, as they don't need too much graphical prowess.
Edit: I checked just to be sure, but this was not the first game. The PlayStation/Saturn games predates this one actually.
Despite the annoyance mentioned above though, I have to admit that Kindaichi Shounen no Jikenbo ~ 10 Nenme no Shoutaijou~ is actually a very decent detective game for the system. Depending on your choices in the prologue, the story can turn into one of two completely different scenarios (with the same basic cast, but with different murders / murderers) and each of those scenarios has multiple endings, so there is a lot to do in the game. The two scenarios are decent enough as puzzle stories: you'll be looking for clues and making daring deductions that wouldn't seem out of place in the actual Kindaichi Shounen no Jikenbo series. Each route is short though, you'll go through them in a few hours, but the replay value is really good.
Overall, Kindaichi Shounen no Jikenbo ~ 10 Nenme no Shoutaijou~ is a surprisingly well-done detective game on the Game Boy Color. It has a lot of content and the puzzle plots themselves are fairly entertaining too. It's one of those games that is well aware of the strength and the limitations of the platform, delivering an experience that feel just right for the Game Boy Color.
Original Japanese title(s): 『金田一少年の事件簿 ～10年目の招待状～』