Disable your network adapter briefly while launching the game. Version 1.5.2 will timeout its "checking for updates" quickly and launch in offline mode.
This is pre-1.9 combat. There is no "cooldown" on sword swings; you can click as fast as possible to deal maximum damage. Unblocked Minecraft 1.5.2
: It features the old combat system (spam-clicking) and the original textures before the major 1.14 overhaul. Setting Up a Private Server Disable your network adapter briefly while launching the
The most helpful features found in version 1.5.2 (the "Redstone Update") and its unblocked browser ports include: Browser-Based Multiplayer Unblocked Minecraft 1.5.2
: It runs smoothly on older hardware or school laptops that might struggle with modern versions like 1.20+.