diff --git a/src/Log/ProjectZomboid/ProjectZomboidClientActionLog.php b/src/Log/ProjectZomboid/ProjectZomboidClientActionLog.php
new file mode 100644
index 0000000..4807225
--- /dev/null
+++ b/src/Log/ProjectZomboid/ProjectZomboidClientActionLog.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Log\ProjectZomboid;
+
+use IndifferentKetchup\Codex\Analyser\AnalyserInterface;
+use IndifferentKetchup\Codex\Analyser\PatternAnalyser;
+use IndifferentKetchup\Codex\Detective\FilenameDetector;
+use IndifferentKetchup\Codex\Detective\WeightedSinglePatternDetector;
+use IndifferentKetchup\Codex\Parser\ParserInterface;
+use IndifferentKetchup\Codex\Parser\PatternParser;
+use IndifferentKetchup\Codex\Pattern\ProjectZomboid\ClientActionPattern;
+
+class ProjectZomboidClientActionLog extends ProjectZomboidEventLog
+{
+    public static function getDefaultParser(): ParserInterface
+    {
+        return static::makePatternParser(
+            ClientActionPattern::LINE,
+            [PatternParser::TIME]
+        );
+    }
+
+    public static function getDefaultAnalyser(): AnalyserInterface
+    {
+        return new PatternAnalyser();
+    }
+
+    public static function getDetectors(): array
+    {
+        return [
+            (new FilenameDetector())
+                ->setPattern('/_ClientActionLog\.txt$/')
+                ->setWeight(0.95),
+            (new WeightedSinglePatternDetector())
+                ->setPattern('/\[\d{17}\]\[(?:ISEnterVehicle|ISExitVehicle|ISWalkToTimedAction)\]\[/')
+                ->setWeight(0.95),
+        ];
+    }
+
+    public function getTitle(): string
+    {
+        return "Project Zomboid Client Action Log";
+    }
+}
diff --git a/src/Pattern/ProjectZomboid/ClientActionPattern.php b/src/Pattern/ProjectZomboid/ClientActionPattern.php
new file mode 100644
index 0000000..84a7b43
--- /dev/null
+++ b/src/Pattern/ProjectZomboid/ClientActionPattern.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Pattern\ProjectZomboid;
+
+/**
+ * Regex constants for the Project Zomboid ClientActionLog.txt format.
+ *
+ * Strict 5-field bracketed structure:
+ *   [time] [steamid][action][player][x,y,z][param].
+ *
+ * LINE captures, in order:
+ *   1. time (DD-MM-YY HH:MM:SS.mmm)
+ *
+ * The remaining bracketed fields are extractable via FIELDS for analysers.
+ */
+class ClientActionPattern
+{
+    public const string LINE = '/^\[(\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3})\] \[\d{17}\]\[[^\]]+\]\[[^\]]+\]\[\d+,\d+,\d+\]\[[^\]]+\]\.$/';
+
+    public const string FIELDS = '/^\[\d{2}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d{3}\] \[(?<steamid>\d{17})\]\[(?<action>[^\]]+)\]\[(?<player>[^\]]+)\]\[(?<x>\d+),(?<y>\d+),(?<z>\d+)\]\[(?<param>[^\]]+)\]\.$/';
+}
diff --git a/test/src/Games/ProjectZomboid/fixtures/client-action-minimal.txt b/test/src/Games/ProjectZomboid/fixtures/client-action-minimal.txt
new file mode 100644
index 0000000..3e729dc
--- /dev/null
+++ b/test/src/Games/ProjectZomboid/fixtures/client-action-minimal.txt
@@ -0,0 +1,10 @@
+[29-04-26 21:41:25.084] [76561198000000001][ISEnterVehicle][Player1][1000,2000,0][Van_LectroMax].
+[29-04-26 21:42:30.152] [76561198000000001][ISExitVehicle][Player1][1001,2001,0][Van_LectroMax].
+[29-04-26 21:46:31.034] [76561198000000001][ISEnterVehicle][Player1][1002,2002,0][Van_LectroMax].
+[29-04-26 21:46:53.257] [76561198000000001][ISExitVehicle][Player1][1003,2003,0][Van_LectroMax].
+[29-04-26 21:47:04.159] [76561198000000002][ISEnterVehicle][Player2][1010,2010,0][Pickup_Truck].
+[29-04-26 21:47:30.512] [76561198000000002][ISWalkToTimedAction][Player2][1011,2011,0][None].
+[29-04-26 21:48:00.812] [76561198000000002][ISExitVehicle][Player2][1011,2011,0][Pickup_Truck].
+[29-04-26 21:50:14.221] [76561198000000003][ISEnterVehicle][AdminUser][1020,2020,0][SUV_Modern].
+[29-04-26 21:51:00.512] [76561198000000003][ISExitVehicle][AdminUser][1021,2021,0][SUV_Modern].
+[29-04-26 21:52:15.018] [76561198000000001][ISEnterVehicle][Player1][1004,2004,0][Van_LectroMax].
diff --git a/test/tests/Games/ProjectZomboid/Log/ProjectZomboidClientActionLogTest.php b/test/tests/Games/ProjectZomboid/Log/ProjectZomboidClientActionLogTest.php
new file mode 100644
index 0000000..b0c4f8d
--- /dev/null
+++ b/test/tests/Games/ProjectZomboid/Log/ProjectZomboidClientActionLogTest.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace IndifferentKetchup\Codex\Test\Tests\Games\ProjectZomboid\Log;
+
+use IndifferentKetchup\Codex\Detective\Detective;
+use IndifferentKetchup\Codex\Log\File\PathLogFile;
+use IndifferentKetchup\Codex\Log\ProjectZomboid\ProjectZomboidClientActionLog;
+use IndifferentKetchup\Codex\Pattern\ProjectZomboid\ClientActionPattern;
+use PHPUnit\Framework\TestCase;
+
+class ProjectZomboidClientActionLogTest extends TestCase
+{
+    private function fixturePath(): string
+    {
+        return __DIR__ . '/../../../../src/Games/ProjectZomboid/fixtures/client-action-minimal.txt';
+    }
+
+    public function testParsesEachLineAsAnEntry(): void
+    {
+        $log = (new ProjectZomboidClientActionLog())->setLogFile(new PathLogFile($this->fixturePath()));
+        $log->parse();
+
+        $this->assertCount(10, $log->getEntries());
+    }
+
+    public function testFieldsRegexExtractsStructuredData(): void
+    {
+        $line = "[29-04-26 21:41:25.084] [76561198000000001][ISEnterVehicle][Player1][1000,2000,0][Van_LectroMax].";
+        $this->assertSame(1, preg_match(ClientActionPattern::FIELDS, $line, $m));
+        $this->assertSame('76561198000000001', $m['steamid']);
+        $this->assertSame('ISEnterVehicle', $m['action']);
+        $this->assertSame('Player1', $m['player']);
+        $this->assertSame('Van_LectroMax', $m['param']);
+    }
+
+    public function testDetectiveDispatchesByContent(): void
+    {
+        $detective = (new Detective())
+            ->setLogFile(new PathLogFile($this->fixturePath()))
+            ->addPossibleLogClass(ProjectZomboidClientActionLog::class);
+
+        $this->assertInstanceOf(ProjectZomboidClientActionLog::class, $detective->detect());
+    }
+}