BlackMass.io is an MMO io game where you can play in different classes, go on adventures, and explore the world.
You get XP by killing monsters, which is the main goal of the game. Watch out for monsters, because if you die, there are no save places to go back to.
You have to sign up before you can play the game. Each has its own set of skills that are best for that job. This means that you can only use things that are meant to be used by this character. When you kill monsters, you get skill points that you can use to improve any skill you want.
When you kill a monster, it might drop a chest with an item inside. To open the box and see what's inside, press the Z key nearby. Right-click and drag the thing to the stash. If the thing isn't found, you'll need to right-click on it to find out more. You'll meet stronger monsters and more valuable things from them as you go deeper into Blackmass io.
Have fun and good luck!