To make multi-platform 2D games, GameMaker Studio is definitely not inferior to the well-known and popular Unity which is one-size-fits-all to both 2D & 3D games development. Of course, as for merely 3D game development, AppNee suggests you choose the Unity instead. Because this task is beyond the strength and power of GameMaker Studio. This advice is especially suitable for non-professional and amateur enthusiasts of game development.

Unity (AKA: Unity3D/Unity2D, U3D for short) is currently the most popular multi-platform free game engine developed by Unity Technologies from Denmark (mainly written in C, C++ and C#, and first released in 2005). Users with C# and JavaScript programming experience can get started more quickly.

Super Mario Bros. X (short for SMB-X or SMBx) is an excellent fan-made game originally developed by Andrew Sprinks (screen name: Redigit). It blended all the classic elements of Super Mario 1, 2, 3 and World along with many new added practical props, such as Ice Flower, Hammer Suit, Tanooki Suit, Kuribo's shoe, The Billy Gun, Yoshi, and more.