If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Forgotten Dungeon is a hack-and-slash action RPG in the vein of Diablo. Slay skeletons, zombies, and other monsters as you explore dungeons. You will gain experience for each kill, and sometimes, enemies will drop items. When you level up, you can upgrade your strength, dexterity, intelligence, vitality, and spells. Increase your attack/damage and defense by equipping yourself with better weapons and armor.