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.
Best Answer
The most important factors for intensity gain are:
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.