Spot What Changed Game is a five-round browser game built on a simple change-detection premise: study a short abstract scene, watch it vanish behind a brief blank flicker, then click the single region where exactly one feature has been altered. Each trial runs the same transparent state machine — an Original frame held for 900 milliseconds, a 180-millisecond neutral mask, then a Changed frame with nine numbered answer zones — so the only real task is to notice where one shape, ray, stripe, dot, or gap has been modified. The Change Blindness Test delivers exactly this routine, with original abstract SVG scenes instead of photographs, deterministic timing, and a fixed five-trial run that ends at 1,000 points. There is no upload, no account, and no clinical claim; the five scenes are entertainment fixtures that demonstrate how brief visual interruptions can hide obvious changes. Every round follows the same literal before-and-after geometry, so locating the change is a matter of trusting the flicker and answering quickly.
What the Spot-What-Changed Browser Game Actually Is
The Change Blindness Test is a five-round observation game drawn entirely from original abstract SVG scenes. Each scene contains rings, squares, rays, stripes, orbit dots, and bridges that the game's own author composed specifically for this fixture set. The scenes are not photographs, not imported perception stimuli, and not clinical material, and the product itself states explicitly that no result claims to measure eyesight, cognition, attention health, or any other clinical ability. Instead, the run is entertainment that uses the same short-flicker pattern that real change-blindness demonstrations use, without the diagnostic framing.
Three properties shape the entire experience. First, every round shows one scene, applies a brief blank mask, then returns with exactly one altered feature. Second, the Changed frame is divided into a three-by-three zone grid where each third of the screen becomes one large semantic button numbered 1 through 9 from left to right and top to bottom. Third, the scoring is a literal arithmetic run: each correct zone adds exactly 200 points and there is no speed multiplier, no random target, no timer penalty, no adaptive difficulty, and no hidden adjustment. Because there are exactly five correct picks in a complete run, the maximum reachable score is exactly 1,000 points.
Why the Blank Flicker Sits Between Every Pair
The 180-millisecond blank mask is the structural centerpiece of the spot-what-changed mechanic. It removes the scene just long enough to interrupt the visual system that normally tracks continuous motion and form, and it is the reason the same scene with one altered feature can look identical at a glance. The mask is also uniform across rounds — it does not preview the answer, it does not shift geometry, and it does not adapt to your response time. Show change now, or the S key, only shortens the Original stage; the 180 ms flicker is preserved before the answer phase, so you never skip the very interruption the game is built around.
Two timing facts matter in practice. The Original frame is fixed at exactly 900 milliseconds, not "about a second" and not a variable preview that depends on hardware. The mask is fixed at exactly 180 milliseconds, which is short enough that a deliberate eye movement can suppress it but long enough to interrupt attention on a casual glance. Together those two numbers form the only timing window you have to encode the scene, and they are identical in every round, which is why comparing your first trial to your fifth trial is a fair comparison.
How to Play the Change Blindness Test in Five Rounds
- Study the Original abstract scene for 0.9 seconds, or press S to request the change sooner if the timing window is too short for your reading rhythm.
- Wait through the 0.18-second blank mask, during which the scene is replaced by a neutral frame that hides any visible motion cues, then watch the Changed frame appear with the same underlying geometry and exactly one altered feature.
- Click the changed zone directly with the pointer or touch, or press the matching number key from 1 through 9 if you prefer keyboard play; each third of the scene is a single large semantic button, so no precision targeting is required.
- Confirm the pick: a correct zone adds exactly 200 points, advances you to the next Original frame, and resets the run timer for that round; a wrong zone is recorded once but does not immediately end the game.
- Finish all five single-feature changes before a second distinct miss to lock the run at exactly 1,000 points; one recoverable error is allowed, but a different wrong zone on a second attempt closes the run in a terminal deadlock.
The Five Abstract Changes You Will Need to Spot
The five rounds are not random. Each before-and-after pair is drawn from the same stable geometry, and only the declared feature changes between Original and Changed frames. The answer layer is not mounted during the Original or the Flicker, so the zones appear only when the Changed frame is visible, which keeps the preview free of clickable hints.
| Round | Original feature | Changed feature | Declared zone |
|---|---|---|---|
| 1 | Central ring | Replaced by a square | 5 |
| 2 | Northwestern ray cluster | Cluster reduced | 2 |
| 3 | Southeastern stripe set | Stripe set rotated | 8 |
| 4 | Northeastern orbit dot | Dot moved along its orbit | 3 |
| 5 | Southwestern bridge | A gap opened in the bridge | 7 |
These are the five literal changes that the game ships with, so the same five before-and-after pairs appear on every run. Memorizing the round order can help you focus your attention, but the timing is identical in every round and the answer layer still hides during the Original phase, so preview knowledge only buys you attention, not advance information. The keyboard route follows the same numbers as the table — press 5, 2, 8, 3, 7 in order — and the pointer route clicks each corresponding third of the screen.
Scoring, Misses, and the Exact 1,000-Point Finish
The score formula is the most boring and most reliable part of the game: 200 points × 5 correct zones = 1,000 points. The short timers control presentation only, not how many points a correct answer earns, so a round you take deliberately and a round you finish quickly are worth exactly the same 200 points. There is no speed bonus, no streak multiplier, and no penalty for taking an extra second before clicking, which is why the entire scoring story can be expressed in one line.
Wrong-zone handling is the only place the run can end early. The first distinct wrong zone is recoverable and does not close the run. If you click the same wrong zone again, the game recognizes it as a repeat and does not consume the second error. Only a second different wrong zone triggers the terminal deadlock that freezes the round and prevents further input. Invalid zone numbers, answers before the Changed phase, and any action after completion or deadlock are harmless no-ops that preserve your state exactly, so accidental keypresses cannot corrupt the run.
Controls, Accessibility, and the Boss Key
Every round follows the same transparent state machine, so the controls are simple to learn. Pointer and touch users can click the altered region directly, and every answer region exceeds the minimum touch target size. Keyboard users can press the matching number without needing precision movement, and visible focus rings plus live feedback make the current state understandable without relying only on color. Reduced-motion users do not depend on decorative movement, the square scene reserves its dimensions to prevent layout shifts, and the blank mask remains the same size during the 180 ms flicker.
The interface uses project surface, foreground, accent, border, danger, and muted tokens to keep the visual language consistent across the run. Double-press Escape opens a simulated spreadsheet boss screen, and a second double-press on Escape resumes the unchanged trial — useful if you need to hide the screen mid-round. Everything runs locally in the page; there is no upload, camera, eye tracker, account, model, third-party image, network request, or personal data. Only the shared best completed score can persist in this browser, and Restart restores trial one, zero points, two available errors, and the complete Original timer.
Other Fixed Visual Challenges in the Same Library
For related fixed visual challenges in the same deterministic style, the spot-what-changed game sits alongside several other browser fixtures. Spot the Difference compares two original harbor scenes and asks you to locate five precise visual changes, which trades the short flicker for a side-by-side view. Pattern Memory Game presents five original 3×3 patterns and asks you to choose each exact hidden record from four options for a 1,000-point finish, which trades the flicker for a longer hold and a recall prompt. Other fixed challenges in the same family include Hidden Object Game, which searches an original illustrated attic for five named objects, and Visual Memory Test, which recalls five fixed grid patterns at your own pace with explicit reveal and hide controls. Each of those games tests a different form of comparison or recall while keeping its fixtures and scoring visible, so you can move from flicker-based change detection to longer-term visual memory without leaving the same deterministic library.