: For Stage Mode interaction, click Connect > Upgrade Firmware . For a fresh start, select Reset Default Program . Troubleshooting Common Errors "Serial Port Not Found"
If you are running macOS Catalina (10.15) or newer, mBlock 3.4.12 because it is a 32-bit application. This version is only compatible with older macOS versions (10.14 Mojave and earlier). For newer Macs, you will need to use mBlock 5 or the web version.
. Developed by Makeblock , this legacy version remains a staple in classrooms and maker spaces worldwide. While newer web-based versions exist, educators and hobbyists continually download version 3.4.12 for its unparalleled stability, comprehensive offline capabilities, and native integration with older hardware kits like the original mBot, Ranger, and classic Arduino Uno architectures. Core Specifications & Architecture Specification Engine Base Scratch 2.0 Open-Source Offline Architecture Core Executable Size ~220 KB (Total installation footprint: ~75 MB) Primary Framework Adobe AIR / Captive Runtime Environment Integrated IDE Native Arduino IDE wrapper (with avr-gcc compiler) Supported OS Windows (XP, 7, 10, 11), legacy macOS (pre-Catalina) Connectivity Serial COM Ports, Bluetooth, 2.4G Wireless Why mBlock 3.4.12 Remains Vital for STEM Education mblock 3.4.12
Run the driver installation tool from the "Connect" menu again.
While (based on Scratch 3.0) is the newer standard, many educators prefer 3.4.12 for specific reasons: : For Stage Mode interaction, click Connect >
: The student built a cardboard maze, and with the logic they had crafted, mBot navigated the turns like a pro, avoiding every obstacle with digital precision. A Legacy of Learning
To understand the importance of mBlock 3.4.12, it's helpful to see it in the broader timeline of the software. The mBlock ecosystem can be divided into two major eras: the classic 3.x series and the modern 5.x series. This version is only compatible with older macOS
Additionally, because the software is based on Scratch 2.0, it inherits its extension capabilities, allowing support for third-party robotic products like Lego or LittleBits.
Despite being outdated, mBlock 3.4.12 is for:
mBlock is a powerful, block-based programming environment designed to bridge the gap between simple, drag-and-drop coding and the more complex world of hardware programming, particularly with Arduino-based robots. Originating as a specialized tool for Makeblock robots like the mBot, it has since grown to support a vast ecosystem of devices. The version we’re focusing on, 3.4.12, represents the final, most refined iteration of the v3.x series, which was built on Scratch 2.0. It embodies the "classic" mBlock experience: a straightforward, offline-first environment that many educators and hobbyists still rely on today for its reliability and direct hardware control.