You need to make a number from 1 to 15. Press the central button on EV3. Сonvert number to binary number system to open the safe. Push the necessary button, that means 1, for example - 15 convert to 1111, and you must to push all keybuttons. If the code is entered correctly, the safe will open.
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✅КАК СДЕЛАТЬ ЛЕГО СЕЙФ С КОЛЕСИКОМ | HOW TO MAKE LEGO SAFE WITH A ROLLER✅