Calc II Explorer u-Substitution Match

u-Substitution Match

Sixty seconds. Four columns. Link an integral to the substitution that cracks it, to the differential that substitution forces, and to the integral you are left holding — match the whole chain and it clears the board.

Mode

Untimed has no clock and records no best — nothing to rush, nothing at stake.

Pick a level
Your best
Easy
—
Medium
—
Hard
—

Kept in this browser only — nothing is uploaded anywhere.

How the scoring works
  • Click a tile in any column to start a chain — the first pick is never wrong, it just says which chain you are going for.
  • Every pick after that is checked straight away. A tile that does not belong costs −5 seconds and breaks your combo; the picks you got right stay lit.
  • Complete all four and the row clears: +10 points and +2 seconds, plus 5 × combo for each clear after the first — so a clean streak pays 10, 15, 20, 25…
  • Clear all five rows and a fresh board is dealt. The clock keeps running.
  • Quitting ends the round and records the score, same as running out of time.
  • In untimed mode there is no clock at all: a wrong pick still breaks the combo but costs nothing, and the round records no best — finish whenever you like.