There's an app call scanmem (in Ubuntu repos) that does this. I used it to win at CandyCrush a few years back. Doing an `apt search` I see there's a GUI for it too. Seemingly works just as you describe.
Cheat Engine is an extremely capable tool too, has lots of reverse engineering features, including a debugger and pointer searching tools, a blue-pill style hypervizor to modify memory undetectably and a very powerful assembly level patcher. Oh, and it's all open source. Seriously nice stuff.
Thank you for this. That program is so nice I think I might even abandon more traditional tools like OllyDbg, since this seems more targeted towards what I usually do with them, anyway.