I downloaded the Hex Editor of Steaver and I want to understant how can I get more time (more than 9:59), more tools and so on. I want to understand how to Hex Edit! Can you help me?

Make the time 09 59 then seatch for the Hex "09 3B"
Next  change it to the amount of time you require i.e. 10 minutes is "0A 00"

Ok, thanks! But why 59 is 3B instead of 59 in hexadecimal and 10 minutes is "0A 00" instead of "10 00"? :???:

I don't know, it does mean though, you can get 255:99 in your level

Because Hexdecimal is another math-system.

What he said. For the record, here's a small recap of the numbers in hex system:

In decimal, you'd get such a suite of numbers: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.

In hexadecimal, that would give this: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10.

The reason why you can't get more than 255 minutes is because the highest possible entry for an individual byte is FF, which equals 255 in decimal form.

Like the colors! 00 = Black and FF = White. I knew this.

It could be great if someone can do a tutorial for the Hex Edit on the level files.

Whoever said you can go up to 255:99 - you can actually go 255:255. I don't know how well this would display though.