Construct 3 is the recently released version of the Construct 2D game engine. If you are interested in trying it out right now might be the ideal time as all functionality is enabled for free until May 28th for the C3Jam hosted on Newgrounds. If you are interested in learning more about Construct 3, be sure to check out our hands-on video available here and embedded below.
The game jam rules require you to use the Construct 3 game engine obviously, with the following requirements as well:
1) Your game must be based on original material, for example you can't use Mario sprites.
2) Your game must not contain unlicensed audio / music.
3) You may work with artists and musicians to support your project!
The theme for this game jam is "Good Things Come in Threes." You can read more about the game jam and Construct 3 engine on the Scirra blog.
Even if you aren't interested in participating in the game jam, this is perhaps the perfect opportunity to give Construct 3 a try.