The keyboard is controlled by an Arduino Pro Micro, which is fairly standard for this type of build — it’s usually that or a Teensy. [Elite Worm] used Cherry MX browns for a nice tactile feel, and added LEDs for a purple-white under-glow. We love the way the printed keycaps turned out, and are impressed because tolerances are notoriously tight for those fruity switch stems.
Starting to think of a few uses for a small custom keypad? This thing is wide open, and [Elite Worm] will even send you the PCB files if you ask nicely. See if you can get past the break without your mouse, and check out the build video while you wait.
Want more flexibility? Just use more switches!
Source: CUSTOM TIBIA KEYBOARD FOR A LEG UP IN THE GAME