1. The script builds a string from a base64 constant then XORs each byte with a key. Base64-decode the constant first (page decoder). Why: obfuscators chain reversible transforms; peel them in reverse order.
2. XOR the decoded bytes with key 0x2a (42) using the page's XOR tool. Why: single-byte XOR is reversible with the same key; the script itself shows the key.
3. The result is the cleartext command containing the flag.
Lesson: obfuscation only delays analysis; peel layers methodically.