Cash and credits is easy
Set guardian to scan all regions
Search for however much cash you have
Buy something, search again, etc
You will eventually narrow down to less than 10 results (or at least something manageable)
Change each one to something different like 100, 200, 300, etc
Keep it low for this step
See which one was correct and then jack that value way up (999,999 usually does the trick without crashing the game)
Do the same with credits
I recommend spending 1 credit at a time by converting credit to cash
Glu games are notoriously easy to hack, this method also worked on gunbros, their star ship game, and plenty more. Samurai zombies is the only one I haven't hacked successfully yet (of the ones I've tried).
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