Stride: various speed and memory use improvements.Protected methods can now be called on Actors and Worlds.New execution control to interrupt long-running execution.Fixed various bugs, especially with save the world and automatic compilation.MSI installer will now automatically remove older MSI versions of Greenfoot when installing.

Added Paste Image functionality in set-image dialog.Improved performance and bug fixes in 'Save the World' feature.Several performance improvements and bug fixes in the Stride editor.See our conversion guide for more details. Changed Greenfoot API to add greenfoot.Font and greenfoot.Color classes to replace the java.awt versions that we were using.Other than looking much better, this solves problems with hi-DPI displays. Re-vamped user interface (now implemented in JavaFX).Fixed documentation when double-clicking Actor/World.Fixed several small save-the-world issues and re-added it to the main menu.Fixed a bug involving mouse clicking on cells that are larger than one pixel.Fixed problem which sometimes stopped inspectors from opening.Fixed using objects from world as arguments in interactive method calls.Fixed a memory leak in the Java editor (caused gradual slowdown and eventual crash).Fixed an issue with context actions being wrongly disabled in the set image dialog.Fixed some editor bugs (especially around function key actions like F4, etc).Fixed a redraw bug in the GifImage helper class.Fixed another memory leak in Greenfoot (caused gradual slowdown and eventual crash).Fixed an issue with the file-changed-on-disk dialog showing too often and appearing multiple times.Fixed an issue with windows being positioned off-screen when first opened.

Fixed an issue where Greenfoot could freeze on Windows, especially while loading.

deb package to include the JDK, to avoid Java packaging issues on Ubuntu and derivatives. Consequently, Greenfoot now requires a 64-bit CPU and 64-bit Operating System.

Moved to Java 11 (OpenJDK+OpenJFX 11).

Improved the 'Instantiate a new world' message.

Fixed an issue with scenarios loaded from an empty window not compiling all classes properly.

Fixed an issue with the world not creating automatically on startup on Mac.

Fixed a bug where lots of small calls to lay would trigger too many repaints, making the delays slower.

Fixed issue where some scenarios could see a 'tearing' or flickering effect during repaint.

Fixed a bug during reset which could cause Greenfoot to freeze or no longer reset.

New hint when you try to call methods like getX() after removing an actor from the world.

Restored the 'twirler' menu that aids terminating a stuck program (accidentally removed in 3.6.1).

Fixed various issues where Greenfoot could get stuck while resetting or terminating the program.

Fixed several corner cases for Greenfoot.ask, especially when used in a constructor.

Added a popup to help select from overlapping actors when clicking them as method call parameters.

Fixed saving/loading of abstract methods in abstract classes in Stride.

Fixed various Stride editor bugs, especially around the frame cursor disappearing.

New Java quick-fix feature to assist with solving simple errors like missing imports.

Rewritten Java editor with better stability and performance.

Fixed issue with Greenfoot crashing on MacOS 12 (Monterey).

Fixed Actor/World documentation not showing up on Linux.

Added autocomplete support for Greenfoot.isKeyDown (and similar static methods) by just completing on 'Gr' and similar.

Mac only release to fix issue with crashing on load in macOS 13 (Ventura).

Fixed a bug where errors on the last line of a Java file (often, reached end of file while parsing after a missing close curly bracket) would not show at all.

Fixed an issue with file opening on Mac.

Switched to Java 17, added support for Java 17 language features.

Greenfoot world documentation