qmk_firmware/keyboards/kudox_game/keymaps/default/keymap.c

#include QMK_KEYBOARD_H

// Each layer gets a name for readability, which is then used in the keymap matrix below.
// The underscores don't mean anything - you can have a layer called STUFF or any other name.
// Layer names don't all need to be of the same length, obviously, and you can also skip them
// entirely and just use numbers.
#define _QWERTY 0
#define _SYMB 1

// Shortcut to make keymap more readable
#define SYM_L   MO(_SYMB)
#define KC_ALEN LALT_T(KC_ENT)

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {

  [_QWERTY] = LAYOUT(
  //┌────────┬────────┬────────┬────────┬────────┬────────┐
     KC_ESC  ,KC_1    ,KC_2    ,KC_3    ,KC_4    ,KC_5    ,
  //└────────┼────────┼────────┼────────┼────────┼────────┤
              KC_Q    ,KC_W    ,KC_E    ,KC_R    ,KC_T    ,
  //┌────────┼────────┼────────┼────────┼────────┼────────┼────────┐
     KC_LGUI ,KC_ALEN ,KC_A    ,KC_S    ,KC_D    ,KC_F    ,KC_G    ,
  //├────────┼────────┼────────┼────────┼────────┼────────┼────────┐
     KC_LSFT ,KC_Z                      ,KC_X    ,KC_C    ,KC_V    ,
  //├────────┼────────┘                 └────────┴────────┼────────┼────────┐
     KC_LCTL                                              ,SYM_L   ,KC_SPC
  //└────────┘                                            └────────┴────────┘
  ),

  [_SYMB] = LAYOUT(
  //┌────────┬────────┬────────┬────────┬────────┬────────┐
     _______ ,KC_6    ,KC_7    ,KC_8    ,KC_9    ,KC_0    ,
  //└────────┼────────┼────────┼────────┼────────┼────────┤
              KC_GRV   ,KC_UP   ,KC_PIPE ,KC_LCBR ,KC_RCBR ,
  //┌────────┼────────┼────────┼────────┼────────┼────────┼────────┐
     _______ ,_______ ,KC_LEFT ,KC_DOWN ,KC_RIGHT,KC_LBRC ,KC_RBRC ,
  //├────────┼────────┼────────┼────────┼────────┼────────┼────────┐
     _______ ,KC_BSPC                   ,KC_CIRC ,KC_LPRN ,KC_RPRN ,
  //├────────┼────────┘                 └────────┴────────┼────────┼────────┐
     _______                                              ,_______ ,_______
  //└────────┘                                            └────────┴────────┘
  )

};