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Graal Online is a set of multiplayer gaming worlds:

Graal Zone: a futuristic and furious 2D battle game.
The goal is to beat the enemy by conquering their bases or by finding all flags and bringing them back to your base. You need to play strategical to be successful - you can use mines for defense, start your jetpack to fly over walls, place boxes to block the path for the enemy or choose the medic class and heal your team members.
You can use one of the numerous futuristic weapons such as laser guns and plasma sabre, or use the wide collection of pistoles, riffles and grenades to overthrow your enemy. Additional weapons can be bought for in-game currency in the dropships or gained in events. On most maps you can also find vehicles such as hover bikes and mechs, which offer protection and powerful arms or let you faster access other parts of the map.

Graal Kingdoms is an adventurous
massively multi player online roleplaying experience. Explore 3-D terrain in a 2-D environment, while battling monsters, forging friendships, and collecting treasures.
Interact with in-game characters and creatures, role play and chat with other players from around the world. Graal Kingdoms allows players to become a part of the story. Players can build houses, protect kingdoms, battle in tournaments, compete in events, and much more!

PlayerWorlds
Can't get enough Graal? How about trying out one of the many playerbuilt servers! Each PlayerWorld has it's own community of people, quests, adventures, events, and all new fun. Not only can you play these worlds, but you can build your own!
With the level editor and npc scripting features, you could construct and design your very own online world. The Graal engine allows for flexibility with just about everything. You could make a 2D online sidscroller, racing game, fighting game, and anything you can imagine. The versatile and easy to learn scripting language enables you to script whatever you can dream.