Trainer work so well, thanks for this.
For those who complain this is not work, i am gonna tell you how to do it properly.
1. If you start with new company, save game and exit. If you have existing company, save it too.
2. Start Trainer, go to save game editor, click open. ( For Windows 7 ) go to C:\Users\( User name )\AppData\Local\Game Dev Tycoon\Local Storage and click file__0.localstorage ( make sure your hidden file is not active )
3. There are 3 to 4 values ( depends how much you have save game. If you have only one comapny, it is only 3 - 4 valus ). Click everything and click "get cash". Run game and voila, money is changed
3a. If you run new company, 70000 is a cash you got in "select a cash" box.
You can have 1 billon or more with this way :
1. Before you change a value, make sure you already finish a game and make money from it.
Example : you have 1 mil. Game production cost 200 k. After finish the game and got review, you got sales. Now save game, then exit.
2. Just like Editor way, do that again.
3. and now, you got yourself 1 mil again ( actual, 999999 ).
4. Then if profit, the yout money will reach above 1 mil ( 1.1 m for example ). Save game, exit and do editor again.
5. After that, you got 10 mil.
6 Do again and again till your satified with your money.
For trainer, its kinda tricky. In mine 5 attempt, i got only working in 2 time.