Well, a game with the word 'Pokemon' stamped across the box definitely means 'kids'.
This system is still being used today, but for a short time, the Mystery Dungeon duo breathed new life on the repetitive system. Pokemon Mystery Dungeon: Red Rescue Team and Blue Rescue Team were the same game, essentially, but on different handhelds. Red for GBA and Blue for DS.
Let's discuss Red Rescue Team, shall we?
A practically 'new' Pokemon on the GBA, Red Rescue Team let you play as a Pokemon. You must answer a quiz, and your answers determine which Pokemon you play. This makes it more interesting, as you are portrayed by a Pokemon the same personality as yours. And another twist is that you are able to befriend fellow Pokemon and include them in your team.
Graphically, Red Rescue Team is colorful and filled with clean, 2D goodness that appeals to kids. Dungeons are relatively large and multi-leveled, giving you lots of room to explore. The GBA's little screen is still a nice one, even though it lacks a second screen, one that its cousin, the DS, has.
The gameplay is pretty repetitive and basic: crawl through dungeons, fighting wild Pokemon and beating the Legendary ones. It's simple, but lengthy.
Red Rescue Team might have breathed fresh air over the series, but it gets repetitive after a while. Something which is not really good.
But since it's a game targeted for hardcore Pokemon fans, repetitive might not be a problem. Seing all those Pokemon and controlling all those Pokemon is heaven enough.