# What happens when you exceed 999999 points in Super Mario Bros.?

I am implementing a replica of the classic Super Mario Bros. in the Unity game engine. The problem is, I do not have a Nintendo Entertainment System.

I somehow found out that getting 100 coins will get you an extra 1UP (life), but what about the score?

There are 6 available decimal spots for the score:

So what happens if the score exceeds 999999?

• NES emulators are widely available to try with. Oct 20, 2020 at 2:43

Nothing special happens when going past 999,999 other than it just displays 7 digits instead. Source

• I might have a follow-up question... Oct 22, 2020 at 15:41
• @AndréStannek and that is..? Oct 22, 2020 at 18:17
• @quetzalcoatl It was just supposed to be a joke because to me, the next obvious question is what happens when you exceed the 7 digits. Fortunately Ray also answered it in his answer :-) Oct 23, 2020 at 7:48
• @AndréStannek: ooh I see. Thanks, I totally was out of ideas re what you could mean and I thought it might be like "1000100pts by jumping.. how long did it take?" etc.. soo...yeah.. my mind went on a totally different route ;) Oct 23, 2020 at 8:08

I quickly checked in an emulator since I didn't know either.

SMB1 stores the score in BCD encoding, using 6 bytes, one for each digit - excluding the units, since score granularity does not go below multiples of 50.

If you have a score of 123,450, the bytes will be `00 01 02 03 04 05`.

The first `00` byte is reserved for properly handling millions. If you ever get scores between 1,000,000 and 9,999,950, there will simply be another digit displayed in front of the always visible 0's:

(The 6 bytes ahead of the marked ones are the TOP score, and the 6 following the Player 2 score.)

Technically, the maximum score possible is 9,999,990, 40 points above the maximum legal score which, as said, must be a multiple of 50.

If you exceed even this limit, the game will properly wrap over to 0, and the score is rendered as with a fresh game, with the millions-digit gone.

This is slightly spoiled by the `TOP- 000000` highscore display at the start screen, leaving a space for the millions.

• Comments are not for extended discussion; this conversation has been moved to chat. Oct 20, 2020 at 17:03