I have been having a blast with game guardian since I found it a few months ago. Here is just a quick post of games that I have successfully hacked for coins/gems/whatever. Some have some extra notes, but they are a bit cryptic, but hopefully can get you started. Please note that I encourage you to pay for a game if you play with it and enjoy it, whether you get extra goodies or not. Coders need to eat too.
Crash of Cars: search dword encrypted, look for large number encrypted. Ignore non-encrypted values.
Idle Miner: search double, unencrypted, ensure not too much cash so display isn't rounded, change a few values of cash until it works. Purchase new mines before getting crazy with cash.
Racing Fever: dword encrypted, simple
Sky Force Reloaded: encrypted, stars spending in upgrade, 340000
Dokdo: go fishing, search for encrypted dword for fish number, sell fish at market and find dollars
Dungeon Quest: search encrypted coins, add to the found value (Q-word) a number multiplied by 8192. Fuzzy search for dword for HP and MP and lock them.
Road to Revenge:
Flip Skater: coins are simple dword encrypted, xor with 444444
Flip diver: float search, not encrypted, modify last value in memory
Ball Blast -- unencrypted dword, second location in mem
Major Mayhem II -- search encrypted float or double. It is a rounded float. e.g. 999.66 =1000 coins
Subway Surfers -- qword, encrypted, value is approx double coin value. Use mystery box repeatedly to get stuff. Same for keys, encrypted dword, first in mem.
Daddy was a thief -- search unencrypted float for coins during play (pause a lot)
Aliens drive me -- no known method
BRIM -- dword, not encrypted, last val in mem. Goto val, next in mem is essence value. complete quests by spending essence
Trigger Heroes -- dword encrypted gives two doubled coin values, make sure to change to even number or crashola.
Runventure: dword encrypted, second value in mem.
Zombie Guard: unencrypted double for coins, landmines, ammo, etc.
Prime Peaks: search for master coin value, unencrypted dword, run a course, die quickly, search new value. Gems are next value in mem.
Mini Racing: unencrypted dword two places in mem, changed both.
Factory: Search unencrypted dword for $$
Tower Crush: Double, unencrypted
Postknight: dword unencrypted coin, next in mem is gems (dword)
Earn to die 2: unencrypted dword cash, pause during play search for unencrypted dword bullet value, mod.
Toon Shooter 2: unencrypted dword for coins during play.
Into Mirror: search money, encrypted dword. only one encrypted value, other stats nearby in mem.
Tiny Archers: unencrypted dword search, second value in mem, gems right after.
Punch Quest: dword during game place, pause, set coins.
Launcha Libre, Burrito Bison: qword for total point value
Dan the man: encrypted dword coin search. Change the only encrypted one.
Dead Racing/Racing Dismount: dword
Sword of Xolan: dword coin, near in memory is fireball count and health--freeze.
Incredible Jack: dword coins
king crusher: search encrypted dword gems, 444000 etc.
Dragon hills: dword, edit first in memory
Sonic: dword master rings, second in mem. Previous in mem is red stars, search gems dword 2nd val in mem.
Tower Conquest: coins xor with 444444, gems xor with 444444; simple quick: search gems xor with 444444;444444:10 = single result
Tankers.play: search dword during matches for incrementing coins, set first val in mem.
Henry Danger: dword coins
slug it out 2: group search three things (coins, gems, other gems), change all. refreshes after battle.
Stickman Trials: dword
Drag'n'Boom: dword coins during play
Soul Knight: coins during play, two locations dword.
quadropus (Butterscotch Shennanigans) all doubles, easy to find.
Mon Rush : pair search of coin;gem:4 ordered. Coin then gem in memory, dword.
Swamp Attack: dword, first in mem
Kung Fu Z: qword group search coins, gems, other things.
Flip Trickster: Dword coins, two places in mem.
Westy West: dword coin search
Jet Pack: search dword during game play, change values (a few locations in mem)
Infinity Upgrade: dword coins during play
Galaxy Gun: dword for health and, LP, money.
Airsoft Royale: dword on coins, 6 dwords later is gems
Drive Ahead!: dword on coins, nearby on bolts
Thumb Drift: play online to get coins on track, crash after finding a few, search dword three places in mem, go offline, mod.
Virtual Beggar: qword coin value, nearby in mem is VC value.
Crashy Cops: dword, unencrypted, pause game from GG change all values (many)
Vertigo Racing: dword and double for coins at main menu, changed both.
Tap! Captain Star: double on coin things
Sky Chasers: search on double the coin value dword during play, search unknown for health/fuel and lock. Reboots game sometimes.
Cosmobot: dword main coin value. Only one place in mem.
Magic Rampage: dword, two locations
Rover Craft: dword on coins, back in mem a bit is gems.
Jump Squad: dword on coins
Smashing Rush: encrypted dword, two values in the millions, changed the second one.
Hang Line: simple dword on coins
Getaway 2: dword, second value in mem.
Stunt Car Challenge 3: pair dword search, ordered coins:bills
Eggon: coins during play, three dwords
Car Eats Car 2: two dwords, edited, but gives strange encrypted value of gems.
Rev Heads Rally: search starting encrypted dword 0 at start of match, each coin increment search value even though the coin total doesn't show on screen, looks like there is an additive offset to encrypt. Add value to all (encrypted and not).
Car Crash: dword on cash value during game
Jump Reward: dword on coins
Sushi Bar: search encrypted double (rounded) multiple places in mem, edit as group. Speed up x10. Search level as dword to accelerate levels.
Giant Boulder of Death: search dword coins, two places
Mobile Shooter: double for all values. Easy to find and change.
Money Tree City: double on bills and gems
Rooms of Doom: pair search on coins/tickets dwords
Cannon Hero: coins, dword
Hopeless Heroes: Tap Attack: dword coins, can't change too large.
Turretz: dword coins, last value in mem.
Road Draw: encrypted dword xor with 444444 plus three values of unencrypted dword
Pixel Car Racer: dword on cash when in garage, spend $200 on dyno to find value, mod two places in mem
Fin and the Ancient Mystery: float on gems, float on health--lock
Hill Climb Racing 2: dword change found coins+1 in mem. Why didn't encrypted dword find this? Nearby was gems+1. Both changed.
Ancient Bricks: simple dword search on gold during play
Flipping Legend: dword coins
Archers 2: dword coins at main menu, two places in mem.
Zombie Catch: dword on coins, nearby in memory is radioactive vials