diff --git a/docs/TRACKING.md b/docs/TRACKING.md
index 88c7f0a..76ea15d 100644
--- a/docs/TRACKING.md
+++ b/docs/TRACKING.md
@@ -79,6 +79,12 @@ persists**: `ingest()` returns before any gradebook write
   same page (`js/scorm_tracker.js`, exelearning issue 2458). Opening or reviewing the
   activity creates no attempt, consumes no allowed attempt and changes no grade; a
   submitted 0 is still recorded like any other score.
+- **Only the iDevices the learner touched are sent.** Once the attempt has started,
+  the seed of every other gradable iDevice on the page is still in `cmi.suspend_data`.
+  The tracker records which `.idevice_node` each interaction landed in and posts
+  `itemscores` for those iDevices only (exelearning issue 2481). An untouched iDevice
+  gets no row in that attempt, so under "Last attempt" it keeps its previous grade,
+  or stays empty if it was never answered.
 - **Flat table.** `exelearning_attempt` holds one row per
   `(exelearningid, userid, attempt, itemnumber)`; `itemnumber=0` is the overall, `>0`
   is an iDevice (`db/install.xml:71-82`). `record_item()` upserts so repeated
diff --git a/js/scorm_tracker.js b/js/scorm_tracker.js
index e507065..f860eb9 100644
--- a/js/scorm_tracker.js
+++ b/js/scorm_tracker.js
@@ -438,19 +438,39 @@
         // score is being written can start the attempt.
         var interactedDoc = null;
         var watchedDocs = [];
+        // The iDevices (by objectid) the learner interacted with during this visit.
+        // The runtime seeds every gradable iDevice on the page with 0, and that seed
+        // stays in suspend_data, so only touched iDevices are sent (exelearning
+        // issue 2481): an untouched one keeps its previous grade, or stays empty.
+        var touched = {};
 
         // Record a learner interaction when it happened inside an iDevice. Navigation
         // and clicks elsewhere in the package do not answer anything.
         function noteInteraction(target) {
-            if (target && typeof target.closest === 'function' && target.closest('.idevice_node')) {
+            var node = target && typeof target.closest === 'function' && target.closest('.idevice_node');
+            if (node) {
                 interactedDoc = target.ownerDocument;
+                if (node.id) { touched[node.id] = true; }
             }
         }
 
+        // The item scores to send: every captured score when interaction gating is
+        // off, otherwise only those of the iDevices the learner touched.
+        function touchedItemScores() {
+            if (!awaitInteraction) { return itemScores; }
+            var out = {};
+            for (var oid in itemScores) {
+                if (itemScores.hasOwnProperty(oid) && touched[oid]) { out[oid] = itemScores[oid]; }
+            }
+            return out;
+        }
+
         // Listen for the learner's own input on a package page. The iframe loads a new
         // document per package page, so this runs whenever the SCO talks to the API.
         function watchDocument(doc) {
-            if (started || !doc || typeof doc.addEventListener !== 'function'
+            // Keep watching after the attempt starts: later pages still need to know
+            // which of their iDevices the learner touched.
+            if (!awaitInteraction || !doc || typeof doc.addEventListener !== 'function'
                     || watchedDocs.indexOf(doc) !== -1) {
                 return;
             }
@@ -477,7 +497,7 @@
             // keep the values buffered for the first real commit.
             if (!dirty || !started) { return true; }
             var snapshot = JSON.stringify(cmi);
-            var payload = buildPayload(cmid, session, cmi, itemScores, sesskey);
+            var payload = buildPayload(cmid, session, cmi, touchedItemScores(), sesskey);
             try {
                 var xhr = xhrFactory();
                 // Synchronous in LMSFinish (student closes the tab); async otherwise.
diff --git a/tests/js/scorm_tracker.test.js b/tests/js/scorm_tracker.test.js
index 3279b94..f0b8935 100644
--- a/tests/js/scorm_tracker.test.js
+++ b/tests/js/scorm_tracker.test.js
@@ -771,3 +771,90 @@ describe('parseSuspend (versioned exe12 payload, core PR #2209)', () => {
         expect(parseSuspend('1. "Quiz"; score: 60%; weighted: 30%.')[1].title).toBe('Quiz');
     });
 });
+
+describe('createScormApi: only the iDevices the learner touched are graded', () => {
+    // Two gradable iDevices on one page, as in the demo activity (True/False + Guess).
+    // On load the runtime seeds both with 0 in a single suspend_data write.
+    const SEED = '1. "Verdadero o falso"; Puntuación: 0%; Peso: 50%.\t'
+        + '2. "Adivina"; Puntuación: 0%; Peso: 50%';
+    let scheduled;
+    function config(xhr) {
+        scheduled = null;
+        return {
+            cmid: 42,
+            trackurl: 'https://example.test/track.php',
+            session: 'tok',
+            bindUnload: false,
+            getScoringDocument: () => document,
+            xhrFactory: () => xhr,
+            setTimeout: (fn) => { scheduled = fn; return 1; },
+            clearTimeout: () => { scheduled = null; },
+        };
+    }
+    function seedOnLoad(api) {
+        api.LMSInitialize('');
+        api.LMSSetValue('cmi.suspend_data', SEED);
+        api.LMSSetValue('cmi.core.score.raw', '0');
+    }
+    beforeEach(() => {
+        document.body.innerHTML = '<div class="idevice_node" id="ide-tf"><button id="tf">Check</button></div>'
+            + '<div class="idevice_node" id="ide-guess"><button id="guess">Check</button></div>';
+    });
+
+    it('does not send the seeded 0 of an iDevice the learner never touched (issue 2481)', () => {
+        const xhr = makeXhr(200);
+        const tracker = createScormApi(config(xhr));
+        seedOnLoad(tracker.api);
+        // The learner plays only the Guess iDevice and gets it right.
+        tracker.noteInteraction(document.getElementById('guess'));
+        tracker.api.LMSSetValue('cmi.suspend_data', '1. "Verdadero o falso"; Puntuación: 0%; Peso: 50%.\t'
+            + '2. "Adivina"; Puntuación: 100%; Peso: 50%');
+        tracker.api.LMSSetValue('cmi.core.score.raw', '50');
+        scheduled();
+        expect(xhr.calls).toHaveLength(1);
+        expect(JSON.parse(xhr.lastPayload).itemscores).toEqual({
+            'ide-guess': { scorepct: 100, weighted: 50, title: 'Adivina' },
+        });
+    });
+
+    it('sends a legitimate 0 for the second iDevice once the learner answers it too', () => {
+        const xhr = makeXhr(200);
+        const tracker = createScormApi(config(xhr));
+        seedOnLoad(tracker.api);
+        tracker.noteInteraction(document.getElementById('guess'));
+        tracker.api.LMSSetValue('cmi.suspend_data', '1. "Verdadero o falso"; Puntuación: 0%; Peso: 50%.\t'
+            + '2. "Adivina"; Puntuación: 100%; Peso: 50%');
+        scheduled();
+        // Then answers the True/False wrongly: its value stays 0, identical to the seed.
+        tracker.noteInteraction(document.getElementById('tf'));
+        tracker.api.LMSSetValue('cmi.suspend_data', '1. "Verdadero o falso"; Puntuación: 0%; Peso: 50%.\t'
+            + '2. "Adivina"; Puntuación: 100%; Peso: 50%');
+        scheduled();
+        expect(JSON.parse(xhr.lastPayload).itemscores).toEqual({
+            'ide-tf': { scorepct: 0, weighted: 50, title: 'Verdadero o falso' },
+            'ide-guess': { scorepct: 100, weighted: 50, title: 'Adivina' },
+        });
+    });
+
+    it('keeps tracking touched iDevices on later pages after the attempt has started', () => {
+        const xhr = makeXhr(200);
+        let current = document;
+        const tracker = createScormApi({ ...config(xhr), getScoringDocument: () => current });
+        seedOnLoad(tracker.api);
+        tracker.noteInteraction(document.getElementById('guess'));
+        tracker.api.LMSSetValue('cmi.suspend_data', '1. "Verdadero o falso"; Puntuación: 0%; Peso: 50%.\t'
+            + '2. "Adivina"; Puntuación: 100%; Peso: 50%');
+        scheduled();
+        // Page 2 carries one gradable iDevice; the learner answers it.
+        current = document.implementation.createHTMLDocument('page 2');
+        current.body.innerHTML = '<div class="idevice_node" id="ide-p2"><button id="p2">Check</button></div>';
+        const listeners = {};
+        current.addEventListener = (type, fn) => { listeners[type] = fn; };
+        tracker.api.LMSSetValue('cmi.suspend_data', '1. "Quiz"; Puntuación: 0%; Peso: 100%');
+        // Real input on the new page must still be watched after the attempt started.
+        listeners.pointerdown({ isTrusted: true, target: current.getElementById('p2') });
+        tracker.api.LMSSetValue('cmi.suspend_data', '1. "Quiz"; Puntuación: 80%; Peso: 100%');
+        scheduled();
+        expect(Object.keys(JSON.parse(xhr.lastPayload).itemscores).sort()).toEqual(['ide-guess', 'ide-p2']);
+    });
+});
diff --git a/tests/track_test.php b/tests/track_test.php
index e2c1ab4..ff9729b 100644
--- a/tests/track_test.php
+++ b/tests/track_test.php
@@ -614,6 +614,39 @@ public function test_ingest_records_a_submitted_zero_under_last_attempt(): void
         $this->assertEqualsWithDelta(0.0, $this->published_grade($instance, $student->id, 1), 0.0001);
     }
 
+    /**
+     * An iDevice missing from itemscores keeps its grade under "Last attempt".
+     *
+     * Contract relied on by the tracker (exelearning issue 2481): it only sends the
+     * iDevices the learner touched during a visit, so an attempt that scores one
+     * iDevice must leave every other iDevice's last grade alone.
+     */
+    public function test_ingest_leaves_items_missing_from_itemscores_untouched(): void {
+        [$instance, $student] = $this->create_activity_with_student([
+            'grademodel'  => EXELEARNING_GRADEMODEL_PERITEM,
+            'grademethod' => \mod_exelearning\local\attempts::GRADE_LAST,
+        ]);
+        [$course, $cm] = $this->course_and_cm($instance);
+        $tf = $this->objectid_for($instance, 1);
+        $guess = $this->objectid_for($instance, 2);
+        $submit = function (string $session, array $itemscores) use ($instance, $course, $cm, $student): void {
+            $result = track::ingest($instance, $course, $cm, $student->id, [
+                'session' => $session,
+                // Raw matches the overall recomputed from the one scored iDevice, so
+                // ingest() does not report a divergence (DEC-6-01).
+                'cmi' => ['cmi.core.score.raw' => '100', 'cmi.core.score.max' => '100'],
+                'itemscores' => $itemscores,
+            ], false);
+            $this->assertTrue($result['ok']);
+        };
+
+        $submit('visitTf', [$tf => ['scorepct' => 100.0, 'weighted' => 50.0, 'title' => 'TF']]);
+        $submit('visitGuess', [$guess => ['scorepct' => 100.0, 'weighted' => 50.0, 'title' => 'Guess']]);
+
+        $this->assertEqualsWithDelta(100.0, $this->published_grade($instance, $student->id, 1), 0.0001);
+        $this->assertEqualsWithDelta(100.0, $this->published_grade($instance, $student->id, 2), 0.0001);
+    }
+
     /**
      * With the master grading switch off (DEC-13-07), ingest() records NOTHING
      * (DEC-126-01).
diff --git a/version.php b/version.php
index 2794860..26c6202 100644
--- a/version.php
+++ b/version.php
@@ -34,7 +34,7 @@
 // in $plugin->release ('dev'); a release-preparation PR commits the final
 // version + semver release BEFORE the tag is created (see DEVELOPMENT.md,
 // "Versioning and releases").
-$plugin->version   = 2026092611;
+$plugin->version   = 2026092612;
 $plugin->release   = 'dev';
 $plugin->requires  = 2024100700;       // Moodle 4.5 LTS+.
 $plugin->supported = [405, 502];       // Moodle 4.5 LTS through Moodle 5.2.