Easy to learn, object oriented language used by Dream Maker, the free game making environment of BYOND (Build Your Own Net Dream). BYOND and DM together are especially suited to making multiplayer online games, but are easy to use to create 2D games of any genre.
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Pros
Pro Active development
DM and BYOND are constantly being developed and expanded, with feedback from the community, and Lummox as the lead developer.
Pro Active community
The BYOND community is helpful, and has been active for decades, so there are many solutions available. You can find many answers in the forums.
Pro Excellent documentation
Documentation is easy to learn, and can be found here.
Pro Quickly create online multiplayer games
Makes networking easy, so you can just make your game.
Pro Easy to learn
One of the easiest to learn languages. Similar to Python and C++.
Cons
Con Proprietary language
DM is owned and developed by BYOND. As such, you will only be able to use it for software created using BYOND's software suite.