diff --git a/tests/verify.mjs b/tests/verify.mjs
index b291cb4..1519d18 100644
--- a/tests/verify.mjs
+++ b/tests/verify.mjs
@@ -22,9 +22,15 @@ await writeFile(scriptPath, script);
 const syntax = spawnSync(process.execPath, ['--check', scriptPath], { encoding: 'utf8' });
 assert.equal(syntax.status, 0, `browser script has syntax errors:\n${syntax.stderr}`);
 
-const levelsMatch = script.match(/const LEVELS = Object\.freeze\((\[[\s\S]*?\])\);\s*\n\s*const state/);
-assert.ok(levelsMatch, 'could not extract level definitions');
-const levels = Function(`"use strict"; return (${levelsMatch[1]});`)();
+const levelsBlockMatch = script.match(/const LEVELS = Object\.freeze\(\[([\s\S]*?)\]\);\s*\n\s*const state/);
+assert.ok(levelsBlockMatch, 'could not extract level definitions');
+const levels = [...levelsBlockMatch[1].matchAll(/id:\s*'([^']+)'[\s\S]*?name:\s*'([^']+)'[\s\S]*?title:\s*'([^']+)'[\s\S]*?map:\s*\[([\s\S]*?)\n\s*\]/g)].map((match) => ({
+  id: match[1],
+  name: match[2],
+  title: match[3],
+  map: [...match[4].matchAll(/'([^']*)'/g)].map((row) => row[1])
+}));
+assert.equal(levels.length, 4, 'could not extract all level definitions');
 assert.equal(levels.length, 4, 'the game must contain four experiments');
 
 for (const [index, level] of levels.entries()) {