First,This game is a hack of Pokemon fire red which makes it a good hack,but there are some glitches  *including going into viridian gym*. Second,This game has great graphics like all other Pokemon games,so graphics is an 8.third, the sound is great because its a Pokemon game and not much of the sound is changed...its good so sound gets a 10.next is addictiveness, the game isnt very addicting since you get over powered Pokemon at the start which makes the game easy.I gotta say the story is great,but it does not change! The depth is always the heart of a Pokemon game, yet however the game is very easy. Finally the difficulty,i rate it a 6 because *as mentioned before* the Pokemon at the star are to over powered! Overall:9.3

Not bad for a first review man, you are already off to a good start by at least making it above the requirements of 100 words and you have the right idea as for what to say for each category which is already half the battle, so good work there. The only thing I would suggest is that you break it down into categories like this: 

Graphics: 7

The graphics of this game are good because blah blah blah..


Sound: 6

The sound of this game is decent but it could use improvement because blah blah blah


This is just an example, you really don't have to do it like this, but it makes it easier to read and also more professional as well. Other than that you have the right idea and the only other thing I can say is to keep reviewing because the more you do it, the better you will get. Just try to follow this format and really describe each category in depth, and you should be all set. Keep up the great work and keep making more reviews!