If you liked Pokemon, or have that "gotta catch 'em all!" mentality, you are going to love this game!
i have to say that this game is actually on par with the first Pokemon, if not better.
The gameplay deals with you going through this tree kingdom and opening gates to other worlds where you can fight and collect monsters. They are randomly generated levels that change each time you enter them in their layout, and you walk from screen to screen finding the exit to where you are so you can proceed to the next level. You also pick up items along the way and whatnot.
The graphics are awesome. Each character looks great when youa re fighting them, and all of the sprites look nice as well. Some of the layouts of the different areas you explore get boring after awhile, but the monsters and the Tree Kingdom that you're in look awesome.
The sound was pretty good too. The synth music is cool and it just fits well with everything.
Not too much in terms of a storyline, but basically your sis is pulled into another world, and only by winning a monster fighting tournament will you be able to try and save her. The fun part of this game is collecting the monsters and opening up new gates to make the Tree grow, and open new areas and more new gates to find new monsters and fight new bosses. Even better than collecting cool monsters is the breeding aspect, which didn't appear for a long time in the Pokemon games.
Breeding is your main key to getting stronger monsters, and being able to fight the bigger and badder monsters in the tournaments. Trading with friends was also a fun way to breed to see if you got different monsters through your friends.
Overall, this is a great game for anyone's collection who is looking for a fun RPG and wants to collect monsters and have the most powerful team in the kingdom! Great mechanics and solid gameplay make this game a must own for RPG fans who have a GBC!