Under rating threshold (hideshow)
In the interest of helping, I'm going to re-write the rules in a slightly less confusing way:
The object of the game is to defeat all monsters. Monsters are hidden under tiles, and can be 1 of 5 different levels, shown at the bottom of the screen from left to right.
When you click on a tile that has a monster, if you are the same level or higher than the monster, you kill it and gain XP equal to it's level. If it's a higher level than you, you lose an amount of HP dependent on how much higher a level it was than you.
(cont.)