Specifically, how should I play in order to achieve a 9.9 intensity, while playing in Classic Mode? I've seen different rounds end in different increments ranging from +0.5 - +0.8, but no explanation is given as to how those point increases are calculated. Specifically:

  • Does your round score correlate to the intensity increase on the next round?
  • Does using a ticket at the start of Classic affect the intensity gains?
  • Is there a time limit on rounds, including the bonus, in order to net the most gain?
  • Do I have to hit a certain amount of damage dealt, and conversely, is there a limit on how much damage I can take?

Some things I've noticed include having a teammate die (in co-cop Classic) can drastically cut the intensity gain down, sometimes resulting in only a gain of +0.1 - +0.2 intensity.

At one point I started a run with Snake, starting at the highest possible difficulty, and using a ticket. I did not have to restart any rounds, and I cleared most of the bonus points in the bonus round. After all was said and done, I still ended at a 9.4, a far cry from the 9.9 needed for the achievement.

  • It’ll be interesting to get an explanation for why this can get 9.9 so easily.
    – scohe001
    Jan 13, 2019 at 16:13

1 Answer 1


The most important factors for intensity gain are:

  • Clear rounds quickly
  • Don't take much damage

I do not believe score or ticket usage are factors, and the bonus round does not matter at all.

Here is an example run of reaching 9.9 before the final boss.

  • I'm not sure if time taken is a factor but maybe dps because I hit 9.9 pretty easily with Link by walling enemies out with projectiles before going for the kill.
    – Nathan
    Feb 12, 2019 at 16:44

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