Basic principle is you travel around the map, doing quests, killing monsters that increase in level as you do.
There are multiple classes such as Warrior, Priest, Necromancer, Vampire, Drunk (forget actual name).
Each class has different abilities.
Many different weapons and armours, magic to be used etc.
Examples of weapons are
and
Examples of armour are
and
It has many skills to learn, some you need to reach higher levels to learn.
Also, you can learn tradeskills such as hunting, woodcutting, weaving to enable you to craft your own weapons, armour and trophies.
You can learn skills actively by donating trophies, and passively so you gain xp in that skill even when not logged in.
Sound is rubbish, but graphics are fantastic.
There is a great fanbase similar to the nature of PPT