The setup. Every calculator key 0–9 has been shuffled into a random position. Some digits are shown to you; the rest are hidden behind dashed # keys. The hidden digits themselves are shown, out of order, in the Missing Digits panel.

Your job: figure out which dashed key holds which hidden digit.

Deduction attempts. Click dashed (#) keys and operators to build a calculation, then press =. You may only use hidden (#) keys in a calculation — never the keys that already show a digit. Each hidden key can be used at most once per attempt, and every attempt needs at least one operator. Pressing consecutive # keys forms a multi-digit number, just like a real calculator. The real result appears after you press =, letting you reason out the hidden values.

Placing a guess. When you think you know a key's value, drag its tile from the Missing Digits panel onto that key. Correct guesses lock in permanently. Wrong guesses cost points and the tile returns to the panel.

Scoring. You start at 100 points.

Level	Blank Keys	Cost per =
Easy	4	-8
Medium	6	-6
Hard	8	-4
Evil	10	-2

A wrong placement guess costs -10 points, always. Score can't go below 0. Solve every key before the score runs out to win.

iQPAD turns an ordinary calculator into a logic puzzle. Behind every shuffled keypad is a hidden permutation of the ten digits — your only tools to uncover it are arithmetic and deduction.

iQPAD is part of the Playega family of thinking games, built by MATHinkCo LLC.