An update to Chrome about a year or two ago broke the previous guide, but not to worry! It is still extremely simple to find the correct process very easily.
Step 1: First, open any flash game.
Step 2: In Chrome, go to Settings -> More Tools -> Task Manager
Step 3: Find the process that says "Plugin: Shockwave Flash". It should also usually be using the most CPU. Copy down the process number.
Step 4: If you're using Bit Slicer on MacOS, you're done! The process ID is the one you need to look for, and Bit Slicer lists out processes in regular decimal. If you're using Cheat Engine, you need to convert that number into hexadecimal (calculator here). Since my process ID was 9579, converting to hex gives me 256B.