Potion Registry

HERE’S
THE IDEA.

Push each numbered ingredient once onto the stack. An operator takes the top two values: the older value is left, the newest value right. Use +, −, × or exact integer ÷. Division by zero, fractions and results outside −999 to 999 are rejected. Use all ingredients and leave exactly the target as the single stack value.

Pause, restart and adjust effects inside the player. Automatic previews never save results. Your progress shows its save status while you play.