This guide matches the level title “Knock Knock” and the verified gameplay image above. Early-level numbering is stable in our checked Android and iOS references, but later updates list different overall totals.
That Level Again Level 13 walkthroughs & guide
That Level Again Level 13, titled “Knock Knock,” uses the same gloomy room, hazards, red switch, and right-side exit as the surrounding stages. The visual repetition is deliberate: the puzzle is not about discovering a new room but about noticing which assumption has changed. For this stage, the decisive action is to tap the closed door itself several times. The game registers the solution through multiple direct taps on the doorway. Once that condition is met, the right-hand door opens and the remaining task is ordinary platform movement.
The screenshot is here for more than decoration. Compare the number and title in the upper-left corner with your own screen before following the steps. If your screen says something different, use the title rather than forcing a mismatched answer. That Level Again Level 13 appears near the start of the game, where the developer is establishing the series' central joke: the room can look identical while the meaning of “press the button” changes completely.
That Level Again Level 13 quick answer: Tap or click the right-side door repeatedly, about two or three times, until it opens. Then guide the character through it.
Step-by-step walkthrough
Read the room
Ignore the red button and focus on the closed door at the far right. The title uses 'knock' literally and points to a direct screen interaction. Keep your movement deliberate; rushing is the easiest way to turn a solved puzzle into a failed platforming attempt.
Trigger the rule
Tap or click the door two or three times in separate, clear contacts. Watch for the panel to rise or the passage to become available. That Level Again Level 13 will only advance after the specific input has registered.
Take the exit
Once the door responds, use the normal movement controls to cross the room and walk through the opening. Keep your movement deliberate; rushing is the easiest way to turn a solved puzzle into a failed platforming attempt.
How to know the solution worked
The clearest confirmation is the door on the far right. Do not assume a press counted only because the character or finger touched the red area; watch for the doorway to open. If the door remains shut, tap the door panel rather than the surrounding wall and make several distinct contacts instead of one long press. Once the door is visibly clear, no second puzzle remains. Cross the platforms, avoid the spikes, and enter the doorway. If the character dies on the route, repeat the trigger after respawning if the door has reset.
Notes and precautions
- The door is the interactive object in this level.
- Separate taps work better than a held press.
- The red switch is not needed.
- Desktop players can use ordinary left clicks.
These distinctions matter because That Level Again Level 13 is designed to catch players who repeat the previous stage's behavior without reading the new title. The title is a clue, the room is a controlled test, and the button is both an object in the world and—depending on the level—a part of the interface. When an action fails, change the kind of input before trying to perform the same input faster.
Tips and tricks
- 1Tap near the center of the door panel.
- 2Use a steady knock rhythm.
- 3Stop tapping once the opening appears.
- 4Complete the platform route only after the door is ready.
Collectibles and secrets
That Level Again Level 13 includes no required collectible. The repeated door taps are the complete hidden interaction behind the 'Knock Knock' clue. We found no evidence that an optional pickup changes the normal completion condition for this stage. If you are only trying to continue the story, focus on the button-door relationship and do not search the dark background for a missing item.
Why this clue makes sense
That Level Again Level 13 is an early demonstration of That Level Again 1's design language. The developer keeps the geometry familiar so a tiny rule change becomes the entire puzzle. That economy is what makes the answer feel obvious after you see it: the room has not withheld information, but it has encouraged a habit. Read the title literally, notice what type of input it suggests, and let the door's animation confirm the result.
In short, the complete That Level Again Level 13 walkthrough is: Tap or click the right-side door repeatedly, about two or three times, until it opens. Then guide the character through it. Use the screenshot and title together if your platform reports a different total number of levels.
That Level Again Level 13: Tap or click the right-side door repeatedly, about two or three times, until it opens. Then guide the character through it.
What this video shows
The That Level Again Level 13 video confirms both the matching room and the input required by “Knock Knock.” This excerpt is limited to the verified 160–168 second segment of the full walkthrough, so check the title shown in the upper-left corner before copying the move. The useful moment is brief: watch the red button and the right-side door at the same time. The door animation is the reliable proof that the activation counted.
Video is especially useful in That Level Again 1 because written verbs such as “press,” “tap,” and “step on” describe different input channels. The clip makes that distinction visible. For That Level Again Level 13, the trigger is multiple direct taps on the doorway. After it fires, the rest of the footage is simply a safe route across the repeated room to the exit.
Video checkpoints
- STARTConfirm the title
Pause long enough to see “13. Knock Knock” in the upper-left. This guards against following a neighboring level that uses the same room.
- ACTIONWatch the red button
The key action is to tap the closed door itself several times. Notice the separation between moving the character and activating the puzzle rule.
- RESULTCheck the door
Look to the far right for the opening animation. The route is safe to begin only after that visual state change.
- EXITCross without rushing
The puzzle is solved, but the spikes can still kill the character. Use short, intentional movement inputs and enter the clear doorway.
What to watch closely
Do not focus only on the character. In the clip, the most important feedback happens away from the character at the doorway. If the door remains shut, tap the door panel rather than the surrounding wall and make several distinct contacts instead of one long press. If your own result differs, pause your movement and compare the exact action shown in the footage. Touch targets can also feel slightly different across phones, tablets, and mouse-based builds, but the underlying condition remains the same.
Before replaying the clip
- The door is the interactive object in this level.
- Separate taps work better than a held press.
- The red switch is not needed.
- Desktop players can use ordinary left clicks.
The video host may show a different device aspect ratio or an older total level count. That does not automatically make the early solution obsolete. We match That Level Again Level 13 using four signals: the game name, level number, displayed title, and visible solution. All four agree for this guide. If a future update changes any of them, Level Clue will revise the mapping rather than silently reuse the old clip.
Practice tips from the footage
- 1Tap near the center of the door panel.
- 2Use a steady knock rhythm.
- 3Stop tapping once the opening appears.
- 4Complete the platform route only after the door is ready.
Collectibles in the video
That Level Again Level 13 includes no required collectible. The repeated door taps are the complete hidden interaction behind the 'Knock Knock' clue. The video is used to verify the normal exit, not to claim a hidden-item route. No collectible detour is necessary before the door opens. If your objective is a platform achievement or Easter egg rather than basic completion, treat that as a separate task.
Text recap
You do not need to scrub through the clip repeatedly. The complete That Level Again Level 13 answer is: Tap or click the right-side door repeatedly, about two or three times, until it opens. Then guide the character through it. Watch once to confirm the input, then reproduce it on your device. The title and image should match your screen, the door should visibly open, and the level ends when the character passes through the right-side exit.
This video mapping was checked on 2026-09-24. The clip is credited to 77boa77 Gamer, published 2020-09-18. Level Clue embeds it through YouTube's privacy-enhanced domain and does not load the player until you choose the video tab and press the load button.
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