The USB numpad keyboard I connected lots of wires to my buttons.
Wiring under the board.
EDIT: Forgot materials
What I bought
1x USB Numpad keyboard, the cheapest one I found cost ~15€
10x Buttons that only gives a signal when they are pushed down
What I already had
lots of 2 wired cable
"lab circuit board" don't know what to call it I used it to connect the USB keyboard circuit board to my wires to the buttons
MDF board one big square and one smaller to separate the left and right side, makes it easier to find the right button close to the middle. 2 triangle shaped to make the board raised one the back side.
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