Use arrow keys to combine tiles with the same number into a tile twice its size. Can you get to 2048 without getting stuck? Play on turbowarp for better graphics: https://turbowarp.org/1183352439?hqpen After getting 2048, you can continue till 32768, and although technically you can make 65536 if you are extremely lucky, combining two 32768s just makes them disappear due to hexadecimal storage limits. (Not that I have combined any, but that what's expected to happen.)
Credit to @TimMcCool 's remake for the assets. The compression list this time uses an unintended feature on Scratch. Since Scratch is written in JavaScript, expressions like '0xFF' can actually be treated like numbers. So every block is encoded as a one-hexdigit hexadecimal. Also used a lot of other techniques outlined on my 'GO in 100 blocks!' project. Unfortunately couldn't reduce it enough to add a thumbnail, so I resorted to a diagonal pattern of blocks. Also, only 2s spawn and there is no animation for sliding blocks, just a swooping animation.
