Based on community changelogs from Chinese forums (Bilibili & Tieba), here is what 1281 fixes:
The name comes from a popular Indonesian gaming content creator (Siku Gaming) who’s well‑known for his PvZ Brutal runs. The dev team decided to honor his community contributions by turning his avatar into a special event zombie . pvz brutal mode ex update 1281 siku link
: The primary source for many Chinese-developed PvZ mods, including Brutal Mode. PvZ-Beta Download Page Based on community changelogs from Chinese forums (Bilibili
Inclusion of hidden "Challenge" stages in the Limbo page. 📥 Access & Installation pvz brutal mode ex update 1281 siku link