reconhacker,
I'm assuming your referring to the reset multiplier. If so, the multiplier hack still works, it just requires additional steps. The problem comes from keeping it after saving, which I have a work around for. I should note that I have only tested this on the browser version so far.
To do so first save your current game (avoids something going wrong). Second, I recommend having a multipler with a decimal value (i.e. 128.1 instead of 128) to make the following easier. Now, search for your current multiplier value. You should find that there are 3-5 addresses with the same value. One corresponds to your current multiplier, while there is another address that corresponds to the multiplier that will be saved by the game, with the others also referencing the multiplier. Change all of them to your desired new value (2048 is the max value, picking a higher number will still give you 2048 after starting the game again). Save in the second open slot (not the first save made in case something went wrong) and restart the game. Load the save you just created to confirm that the multipler has been permanently applied. Now play long enough for the game to autosave. Restart the game again to confirm that the new multipler is permanently attached to the autosave file.
With that aside, I am interested in investigating how to get additional diamonds. Does anyone know what type this value is saved under and whether the game uses a multipler to hide it?
Edit: Since I can't add another post even after all this time (WHY btw?!), I'll just edit it in here. I'm still interested in seeing if the diamond value can be found in cheatengine, but for now, shawnsoo's save editor recommendation works quite well. I wish I could vote it working bud, but I'm not at the post count -.-