Welcome to 1988... Windows 2.0 just got released... But not about it. Scratch is here. Press [Space] to place selected block (Selected block is displayed in bottom-right corner) or click on selected block. Press [B] to change block. Click on a block to remove it. Press [N] to remove last block. Up and Down arrows to scroll. Press Green Flag (in the project) or press [F] to run the project. Press [S] to save your project. Press [D] to load a project.
Don't share your projects in the comments. Do it here: https://scratch.mit.edu/discuss/topic/540006/ Also, projects that start with "move 10 pixels forward" block(s) will be broken. Sorry. Start with the "show" block if you need to move forward at the start of the project. Proposed to be featured by @FanaticReturns! Thank yo- oh wait. Now it can't be featured...