There should be a question mark you can press or hover over to see how the mini-games work and there is a quick save but no auto save as far as i've seen, no rollback at all either

i don't find enougu money to cure kitchen's problem
where can i find it?

use the computer in MC's bedroom

There are 2 regular mini games. In 1 you have to click on the green bar as it passes. The other you have to avoid the black marks. Think of the second one as moving a ball before it gets hit.