Click here to play Hotel City directly on facebook!
Working as at 4th April.
Note: Only works on NEW accounts straight after the game’s tutorial. Any other accounts will encounter error 14. It has to be immediately after the game’s tutorial.

You need:

-Cheat Engine
-Flash 10
-Firefox

Step by step tutorial for Exp. cheat:

1) Enter Hotel City [click above to play]
2) Gain some exp.
3) Open cheat engine and select browser in process list
4) Tick Hex, 8bytes, Also scan read only mem.
5) Scan “544A89C803544A8B”
6) 1 address returned. Right click disassemble
7) Right click selected code and choose Toggle Breakpoint
Wait till the browser/game freeze. Change the EAX value to “99999″ [Do NOT be greedy as you may accidentally put an invalid value which WILL corrupt your game and you cannot play it ever again]
9) Right click selected code and choose Toggle Breakpoint again.
10) Click Debug > Run.
11) Watch as your EXP increase. Repeat steps 7-10 to continue increasing exp.
As mentioned I will not be responsible if your game screws up because you used other values.

Coins Steps:

1) Enter Hotel City
2) Gain some exp.
3) Open cheat engine and select browser in process list
4) Tick Hex, 8bytes, Also scan read only mem.
5) Scan “285A89D803285A8B”
6) 1 address returned. Right click disassemble
7) Right click selected code and choose Toggle Breakpoint
Wait till the browser/game freeze. Change the EAX value to “FFFFFF” [Do NOT be greedy as you may accidentally put an invalid value which WILL corrupt your game and you cannot play it ever again]
9) Right click selected code and choose Toggle Breakpoint again.
10) Click Debug > Run.
11) Watch as your Coins increase. You will have a few billion coins. Sufficient for Life.

Credits: pwnthis.net