User:Tada

Tera-Instinct (a.k.a. ONE SHIT) scoring:

For any line clear: Base * (Lines^L) * (Level^2) * (2 ^ S) * combo

Base: min(lines cleared so far * 2, 100) Lines: Number of lines cleared. L: Line exponent. 2.0 + floor(Level / 100) * 0.2, 4.0 for the credit roll. S: Section exponent combo: combo + ((2*lines) - 2) for any clear, set to 1 for no clear.
 * For levels < 500: floor(level / 100)
 * Levels 500-999: floor((level-500)/100) * 2 - 5
 * Credit roll (invisible): 13 + floor((0.1*singles)+(0.2*doubles)+(0.5*triples)+(1.0*tetrises))
 * Credit roll (disappearing): 13

If a grade of S9 or higher is reached by level 999, then an invisible roll, is earned. Otherwise, the disappearing roll is given, and the highest grade a player may earn is M, regardless of score.