⚡ Logic Gates

How to play

Each round shows one logic gate, a short description of what it does, and a target output of 0 or 1. Set the input switches so the gate produces that target, then confirm it. Most gates take two inputs; NOT takes one. The output box recalculates the moment you flip a switch, so you can see the result before committing.

• Input boxes — click or tap an input to flip it between 0 and 1.
• Check button — submits the current inputs. The result is scored and a new round starts about a second later.
• Next button — skips to a new round without scoring it. Skipping resets your streak to zero.

Scoring

A correct answer is worth 10 points plus 3 for every answer already in your streak, so the fourth in a row pays 19 and the tenth pays 37. A wrong answer costs nothing but resets the streak. The level is derived from your score at 40 points per level, and the level decides which gates appear: rounds start with AND and OR only, then NOT, XOR, NAND and NOR are added as you climb, with all six in the pool from level 12.

Tips

• Read the description line rather than trusting the gate name, especially for the inverted NAND and NOR.
• Check the live output box before pressing Check. It already shows what the gate produces for your inputs.
• The streak bonus grows by 3 each time, so never use Next just to dodge a gate you are unsure of.
• For a target of 0 start from both inputs at 0, for a target of 1 start from both at 1. One of those is the answer outright for four of the six gates.

Frequently asked questions