How do I play Logic Gate Puzzle?

Connect OUT ports on sources or gates to empty IN ports on gates or the final OUTPUT. Fill every required input, route every gate toward OUTPUT, and make the final result TRUE.

What do AND, OR, and NOT do?

AND is TRUE only when both inputs are TRUE. OR is TRUE when either input is TRUE. NOT has one input and returns its opposite Boolean value.

Do invalid wires count as mistakes?

No. Unknown ports, malformed directions, self-links, duplicate edges, occupied-input attempts, and directed cycles are rejected without changing the board. Only a complete valid graph with a FALSE result records a logical error.

What produces the exact 1,000-point score?

Each of the five solved levels earns 200 points. Complete all five with a TRUE final output for an exact total of 1,000 points.

Can I revise a connected input?

Yes. With no output selected, click or focus the filled IN port and activate it to disconnect the wire. Then select another OUT port and an empty IN port to place a new connection.

Logic Gates Puzzle Online: Build Five TRUE Circuits

A logic gates puzzle online is a directed Boolean circuit challenge: wire fixed source values through AND, OR, and NOT gates until the final output is TRUE on all five levels for an exact 1,000-point score. Logic Gate Puzzle is the direct match for that task. Each board contains fixed binary sources, one or more gate cards, and a final OUTPUT card. You construct a real directed graph rather than choose a multiple-choice answer. Start with an OUT port on a source or gate, then select an empty gate IN port or the final OUTPUT IN port. An OUT may fan out to multiple destinations, but each input accepts exactly one driver. The evaluation engine begins at the final output and works backward through its drivers, applying the Boolean values produced by the three gate types. It checks a graph only when every declared input has one incoming wire and every gate output reaches OUTPUT. Invalid directions and directed cycles are refused without changing the board, while partial diagrams remain editable. That makes the objective concrete: construct every valid circuit, verify the final result, and solve all five fixed levels.

Complete five TRUE circuit targets

Open Logic Gate Puzzle and you receive a fixed arrangement of binary SOURCE cards, gate cards, and one final OUTPUT card. Sources do not change between attempts, and the five boards are original fixed puzzles rather than generated exercises. Your task is to connect ports, not write formulas or select an answer from a list. The visible direction rule is always OUT to IN: choose an output port on a source or gate, then choose an unoccupied input on a later gate or on the final OUTPUT.

A graph is evaluated only when all declared gate inputs and the final OUTPUT input have exactly one incoming wire. Every gate output must also have a directed path to the final output. Until that condition is met, the diagram is still work in progress rather than a mistake. Missing ports are never given guessed values, and incomplete diagrams do not receive partial credit. Once the graph is structurally complete, the Boolean values determine whether OUTPUT is TRUE or FALSE.

Why this directed game fits the task

The game turns an abstract Boolean operation into a manageable wiring problem. You can inspect each source before committing a connection, use one output in more than one place, and revise an occupied input without rebuilding the board. The directed wire ledger records every edge from its driver to its destination, while each connected input identifies its driver. These visible constraints make fan-out, one-driver inputs, and disconnected edits easier to understand than an unassisted paper diagram.

Logic Gate Puzzle also avoids changing source values to manufacture difficulty. Every level is deterministic, with no timer, speed bonus, random source value, hidden multiplier, adaptive difficulty, or partial-credit formula. It runs locally in the browser and requires no account, download, upload, API, remote solver, or personal data. The game is intended for entertainment and introductory Boolean practice, not for simulating transistor timing, voltage thresholds, propagation delay, electrical loading, or physical hardware.

Wire each level to a TRUE output

Read every source and gate before selecting a port. Mark which sources are TRUE or FALSE and count the inputs required by each gate. NOT has one input, while AND and OR each have two.
Select a source OUT port. Use the selected-port indicator to confirm which output will drive the next edge. One output may be connected to more than one empty input.
Choose an empty gate IN port or the final OUTPUT IN port. The connection must follow the OUT-to-IN direction. Input-to-input, output-to-output, self-links, and unknown destinations are not valid edges.
Fill each required gate input. Do not stop at the first available source. The first level demonstrates that a TRUE source used for an AND gate must fan out to both inputs because either FALSE input would make the result FALSE.
Route every gate toward OUTPUT. Follow the selected output through the directed wire ledger, confirm that every connected input names its driver, and check that no gate branch ends before reaching the final card.
Check the Boolean result. Evaluate the completed graph from the final OUTPUT backward. AND is TRUE only when both inputs are TRUE, OR is TRUE when either input is TRUE, and NOT reverses its single input.
Revise a filled input when necessary. With no output selected, click a filled IN port to disconnect it. Select a different OUT port and then the newly empty IN port to place the replacement edge.
Solve all five fixed levels. Continue to the next unchanged board after each TRUE output. A TRUE circuit earns 200 points; the goal is to complete all five boards without producing two distinct complete FALSE graphs.

Read Boolean values before choosing each wire

Choose source values by the result the circuit requires, not by filling ports at random. These fixed truth-table definitions are consistent with the MIT OpenCourseWare introduction to digital electronics and the Northwestern University Mechatronics Logic Gates reference.

Operation	Input state	Result
AND	FALSE and FALSE	FALSE
AND	FALSE and TRUE	FALSE
AND	TRUE and FALSE	FALSE
AND	TRUE and TRUE	TRUE
OR	FALSE and FALSE	FALSE
OR	FALSE and TRUE	TRUE
OR	TRUE and FALSE	TRUE
OR	TRUE and TRUE	TRUE
NOT	Input is TRUE	FALSE
NOT	Input is FALSE	TRUE

The opening level teaches AND with one TRUE source and one FALSE distractor. The useful source must reach both AND inputs, showing why output fan-out matters. The second level introduces OR with three sources; one TRUE signal is enough for the result, but both required input ports still need drivers. The third level focuses on NOT, where routing a FALSE source into the inverter produces TRUE.

Later boards combine the operations. One circuit sends a FALSE source through NOT and then joins that result with a TRUE source at AND. The final circuit creates an OR branch and a NOT branch that feed a last AND gate. Work backward from OUTPUT on these combined boards: identify the value required at the final gate, determine which intermediate branch can provide it, and then select the source that gives that branch its required value.

Follow the fixed route and score

Each solved circuit is worth 200 points. The complete scoring route is 200 points per level × 5 levels = 1,000 points. There is no bonus for finishing quickly and no penalty for taking time to inspect or revise a valid partial graph. Because the sources and layouts are fixed, restarting the same board produces the same puzzle rather than a new arrangement.

Restart always returns to the first board with empty wires and a score of zero. The original five levels remain in the same order, so repetition can focus on wiring accuracy, Boolean reading, or keyboard control without introducing a random board. Only the shared best completed score may remain stored in the browser.

Repair graphs without losing useful work

Connection validation applies before a proposed edge changes the circuit. A second driver for an occupied input, a duplicate edge, or any other malformed connection is rejected without altering the board. These structural rejections are not logical mistakes because the rejected edge never enters the graph. Check the visible driver name and the FROM-to-TO ledger if an unexpected connection is refused.

Unknown ports are not accepted.
Input-to-input and output-to-output attempts are rejected.
A source or gate cannot connect to itself.
An occupied input cannot receive a second driver.
The same directed edge cannot be added twice.
A directed cycle is rejected and never evaluated.

After the graph is complete, the engine resolves it backward from the final OUTPUT through its drivers. It does not guess a value for a missing port and does not evaluate a cyclic graph. A complete valid graph that produces FALSE records one recoverable graph error. Disconnect the incorrect edge, choose a different valid topology, and test again. Rebuilding exactly the same wrong edge set is deduplicated and cannot consume another error. A second distinct complete graph that also produces FALSE closes the run.

The repair rule makes careful experimentation practical. Filling a new input is not itself a mistake, and a complete circuit does not need restarting simply because its first logical result was FALSE. Click the filled IN with no OUT selected, replace the driver, and continue on the same level.

Use pointer, touch, or keyboard controls

Pointer and touch players use large source, gate, input, and output buttons. The current output is shown both visually and in text, each connected input names its driver, and the wire ledger lists every edge as FROM to TO. These redundant indicators help you verify direction before adding another wire.

Keyboard play uses Tab to move through every port. Use Enter or Space to select an output, connect an input, or disconnect an occupied input when no output is selected. The same board rules apply regardless of control method, so pointer edits, touch selections, and keyboard actions use the same validation and scoring.