is there a possibility for max money?
Use Cheat engine.
still don't understand how cheat engine works
how do you determine what 4 byte number is needed to change the value?
Sometimes it's not 4 bytes, but in this case it is.
This is what you should do (for any game) (I'll assume that you are trying to change the amount money):
1. Pick a moment in game where you can quickly change the amount of money you have, in this game it would be on, for example, supermarket menu, make sure you have enough money to buy something (because you want the value to change);
2. Before changing the money value in game (so, before you buy anything in supermarket, in this case) input the money value you have in cheat engine. Click "First Scan".
3. This will give you a list of addresses. Now go to the game and buy something, you are doing this to change the value of the money in game.
4. Now return to cheat engine. Input the new money value that you have and click "Next Scan".
5. This will give a list of addresses and values that is shorter (usually) than the first list of addresses.
6. At this point, you have two choices. You can repeat 3-5, until you have only one (sometimes very difficult) address, at which point you are certain that the address you have is for the money. Or, at any point in this process (could be first scan) if you have <5 (this is an arbitrary number) addresses, it's
usually safe to change the value of all of them to the money value that you want.
After finding the address (or addresses) that you think are right, double click (the addresses go to the menu below), then double click where it says "Value" and input the number (money in this case) that you want. If you have multiple addresses, change the value on all of them. If you change
multiple addresses anything can happen in game (crash, etc) so save before you do this. You can't (or it's very rare) mess up the game permanently (at least if you are trying to change simple stuff like money), because when you restart the game the values of the addresses that would crash your game (for example, anything can happen really) reset.
The reason for 1.) is that you want to change as little as possible in game in between scans, this makes it easier for you to find the address that you want.
Basically, you are searching for the address of the money in cheat engine. To facilitate this, cheat engine allows you to do a first scan and then do future searches on that list (to shorten it). Obviously, future scans are more useful if you look for different values.
I said this is what you should do for any game, but take notice that it might be much more complicated than this, depends what you are trying to do/change on a given game, but for the money on this game you can follow this.
Edit: Just made a ELI5 for cheat engine. For the love of god, someone give me a thumbs up
Edit2: thank you
Edit3: ok guys, you can stop now
Edit4: With the last edit, I reverse psychology you to give me thumbs up, and it worked, have some shame