diff --git a/keyboards/ergo42/keymaps/biacco-underglow/config.h b/keyboards/ergo42/keymaps/biacco-underglow/config.h
new file mode 100644
index 00000000000..bc80be306a4
--- /dev/null
+++ b/keyboards/ergo42/keymaps/biacco-underglow/config.h
@@ -0,0 +1,43 @@
+/*
+This is the c configuration file for the keymap
+
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+Copyright 2015 Jack Humbert
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef CONFIG_USER_H
+#define CONFIG_USER_H
+
+#include "../../config.h"
+
+/* Use I2C or Serial, not both */
+
+#define USE_SERIAL
+// #define USE_I2C
+
+/* Select hand configuration */
+
+#define MASTER_LEFT
+// #define MASTER_RIGHT
+// #define EE_HANDS
+
+// Underglow
+#undef RGBLED_NUM
+#define RGBLED_NUM 14    // Number of LEDs
+#define RGBLIGHT_ANIMATIONS
+#define RGBLIGHT_SLEEP
+
+#endif
diff --git a/keyboards/ergo42/keymaps/biacco-underglow/keymap.c b/keyboards/ergo42/keymaps/biacco-underglow/keymap.c
new file mode 100644
index 00000000000..7722eb0068e
--- /dev/null
+++ b/keyboards/ergo42/keymaps/biacco-underglow/keymap.c
@@ -0,0 +1,155 @@
+#include QMK_KEYBOARD_H
+
+extern keymap_config_t keymap_config;
+
+#define BASE 0
+#define META 1
+#define SYMB 2
+#define GAME 3
+#define RGB  4
+
+// Fillers to make layering more clear
+#define _______ KC_TRNS
+#define XXXXXXX KC_NO
+
+#ifdef RGBLIGHT_ENABLE
+//Following line allows macro to read current RGB settings
+extern rgblight_config_t rgblight_config;
+#endif
+
+enum custom_keycodes {
+  RGB_RST = SAFE_RANGE,
+  TAP_ANIM
+};
+
+const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+
+  /* BASE
+   * ,------------------------------------------------.   ,------------------------------------------------.
+   * | Tab  |   Q  |   W  |   E  |   R  |   T  |  [   |   |  ]   |   Y  |   U  |   I  |   O  |   P  |  @   |
+   * |------+------+------+------+------+------+------|   |-------------+------+------+------+------+------|
+   * | Alt  |   A  |   S  |   D  |   F  |   G  |  (   |   |  )   |   H  |   J  |   K  |   L  |   ;  |  :   |
+   * |------+------+------+------+------+------+------|   |------|------+------+------+------+------+------|
+   * | Sft  |   Z  |   X  |   C  |   V  |   B  |  {   |   |  }   |   N  |   M  |   ,  |   .  |   /  |\/Sft |
+   * |------+------+------+------+------+------+------|   |------+------+------+------+------+------+------|
+   * | Ctrl | GUI  |  App |PrtSc |ESC/  |Space/|Tab/  |   |Back  |Enter/| Del  |PrtSc |=>GAME|=>RGB |  \   |
+   * |      |      |      |      |~SYMB |RCtrl |Shift |   |Space |~META |      |      |      |      |      |
+   * `------------------------------------------------'   `------------------------------------------------'
+   */
+  [BASE] = LAYOUT( \
+    KC_TAB,   KC_Q,    KC_W,   KC_E,    KC_R,             KC_T,          KC_RBRC,       KC_BSLS,    KC_Y,             KC_U,    KC_I,     KC_O,     KC_P,     KC_LBRC, \
+    KC_LALT,  KC_A,    KC_S,   KC_D,    KC_F,             KC_G,          S(KC_8),       S(KC_9),    KC_H,             KC_J,    KC_K,     KC_L,     KC_SCLN,  KC_QUOT, \
+    KC_LSFT,  KC_Z,    KC_X,   KC_C,    KC_V,             KC_B,          S(KC_RBRC),    S(KC_BSLS), KC_N,             KC_M,    KC_COMM,  KC_DOT,   KC_SLSH,  SFT_T(KC_RO), \
+    KC_LCTRL, KC_LGUI, KC_APP, KC_PSCR, LT(SYMB, KC_ESC), RCTL_T(KC_SPC), SFT_T(KC_TAB), KC_BSPC,    LT(META, KC_ENT), KC_DELT, KC_PSCR,  TG(GAME), TG(RGB), KC_JYEN \
+  ),
+
+  /* META
+   * ,------------------------------------------------.   ,------------------------------------------------.
+   * |   1  |   2  |   3  |   4  |   5  |   6  |  [   |   |  ]   |   7  |   8  |   9  |   0  |   -  |  ^   |
+   * |------+------+------+------+------+------+------|   |-------------+------+------+------+------+------|
+   * | Alt  |  F1  |      |Muhen | Henk |      |  (   |   |  )   | Left | Down |  Up  |Right |      |      |
+   * |------+------+------+------+------+------+------|   |------|------+------+------+------+------+------|
+   * | Sft  |  F2  |  F3  |  F4  |  F5  |  F6  |  {   |   |  }   |  F7  |  F8  |  F9  | F10  | F11  |\/Sft |
+   * |------+------+------+------+------+------+------|   |------+------+------+------+------+------+------|
+   * | Ctrl | GUI  |  App |PrtSc |ESC/  |Space/|Tab/  |   |Back  |Enter/| Del  |Reset |=>GAME|=>RGB |  \   |
+   * |      |      |      |      |~SYMB |RCtrl |Shift |   |Space |~META |      |      |      |      |      |
+   * `------------------------------------------------'   `------------------------------------------------'
+   */
+  [META] = LAYOUT( \
+    KC_1,    KC_2,    KC_3,    KC_4,    KC_5,    KC_6,    _______, _______, KC_7,    KC_8,    KC_9,  KC_0,    KC_MINS, KC_EQL, \
+    _______, KC_F1,   XXXXXXX, KC_MHEN, KC_HENK, XXXXXXX, _______, _______, KC_LEFT, KC_DOWN, KC_UP, KC_RGHT, XXXXXXX, XXXXXXX, \
+    _______, KC_F2,   KC_F3,   KC_F4,   KC_F5,   KC_F6,   _______, _______, KC_F7,   KC_F8,   KC_F9, KC_F10,  KC_F11,  SFT_T(KC_RO), \
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, RESET, _______, _______, _______ \
+  ),
+
+  /* SYMB
+   * ,------------------------------------------------.   ,------------------------------------------------.
+   * |   !  |   "  |   #  |   $  |   %  |   &  |  [   |   |  ]   |   '  |   (  |   )  |   ~  |   =  |  ~   |
+   * |------+------+------+------+------+------+------|   |-------------+------+------+------+------+------|
+   * | Alt  |      |      |      |      |      |  (   |   |  )   |      |      |      |      |   +  |  *   |
+   * |------+------+------+------+------+------+------|   |------|------+------+------+------+------+------|
+   * | Sft  |      |      |      |      |      |  {   |   |  }   |      |      |   <  |   >  |   ?  |  \   |
+   * |------+------+------+------+------+------+------|   |------+------+------+------+------+------+------|
+   * | Ctrl | GUI  |  App |PrtSc |ESC/  |Space/|Tab/  |   |Back  |Enter/| Del  |PrtSc |=>GAME|=>RGB |  \   |
+   * |      |      |      |      |~SYMB |RCtrl |Shift |   |Space |~META |      |      |      |      |      |
+   * `------------------------------------------------'   `------------------------------------------------'
+   */
+  [SYMB] = LAYOUT( \
+    S(KC_1), S(KC_2), S(KC_3), S(KC_4), S(KC_5), S(KC_6), _______, _______, S(KC_7), S(KC_8), S(KC_9),    S(KC_0),   S(KC_MINS), S(KC_EQL), \
+    _______, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, _______, _______, XXXXXXX, XXXXXXX, XXXXXXX,    XXXXXXX,   S(KC_SCLN), S(KC_QUOT), \
+    _______, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, _______, _______, XXXXXXX, XXXXXXX, S(KC_COMM), S(KC_DOT), S(KC_SLSH), S(KC_RO), \
+    _______, _______, _______, _______, _______, _______, _______, _______, _______, _______, _______,    _______,   _______,    _______ \
+  ),
+
+  /* GAME
+   * ,------------------------------------------------.   ,------------------------------------------------.
+   * | Tab  |   Q  |   W  |   E  |   R  |   T  |  [   |   |  ]   |   Y  |   U  |   I  |   O  |   P  |  @   |
+   * |------+------+------+------+------+------+------|   |-------------+------+------+------+------+------|
+   * | Alt  |   A  |   S  |   D  |   F  |   G  |  (   |   |  )   |   H  |   J  |   K  |   L  |   ;  |  :   |
+   * |------+------+------+------+------+------+------|   |------|------+------+------+------+------+------|
+   * | Sft  |   Z  |   X  |   C  |   V  |   B  |  {   |   |  }   |   N  |   M  |   ,  |   .  |   /  |\/Sft |
+   * |------+------+------+------+------+------+------|   |------+------+------+------+------+------+------|
+   * | Ctrl | GUI  |  App |PrtSc | ESC  |Space |Tab   |   |Back  |Enter | Del  |PrtSc |=>GAME|=>RGB |  \   |
+   * |      |      |      |      |      |      |      |   |Space |      |      |      |      |      |      |
+   * `------------------------------------------------'   `------------------------------------------------'
+   */
+  [GAME] = LAYOUT( \
+    KC_TAB,   KC_Q,    KC_W,   KC_E,    KC_R,   KC_T,   KC_RBRC,    KC_BSLS,    KC_Y,   KC_U,    KC_I,     KC_O,    KC_P,    KC_LBRC, \
+    KC_LALT,  KC_A,    KC_S,   KC_D,    KC_F,   KC_G,   S(KC_8),    S(KC_9),    KC_H,   KC_J,    KC_K,     KC_L,    KC_SCLN, KC_QUOT, \
+    KC_LSFT,  KC_Z,    KC_X,   KC_C,    KC_V,   KC_B,   S(KC_RBRC), S(KC_BSLS), KC_N,   KC_M,    KC_COMM,  KC_DOT,  KC_SLSH, SFT_T(KC_RO), \
+    KC_LCTRL, KC_LGUI, KC_APP, KC_PSCR, KC_ESC, KC_SPC, KC_TAB,     KC_BSPC,    KC_ENT, KC_DELT, KC_PSCR,  _______, _______, KC_JYEN \
+  ),
+
+  /* RGB
+   * ,------------------------------------------------.   ,------------------------------------------------.
+   * |      |      |      |      |      |      |      |   |      |      |      |      |      |      |      |
+   * |------+------+------+------+------+------+------|   |-------------+------+------+------+------+------|
+   * |      |      |      |      |      |      |      |   |      | TOG  | HUI  | SAI  | VAI  |HUANIM|      |
+   * |------+------+------+------+------+------+------|   |------|------+------+------+------+------+------|
+   * |      |      |      |      |      |      |      |   |      | MOD  | HUD  | SAD  | VAD  |RESET |      |
+   * |------+------+------+------+------+------+------|   |------+------+------+------+------+------+------|
+   * |      |      |      |      |      |      |      |   |      |      |      |      |      |=>RGB |      |
+   * `------------------------------------------------'   `------------------------------------------------'
+   */
+  [RGB] = LAYOUT( \
+    XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, \
+    XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, RGB_TOG, RGB_HUI, RGB_SAI, RGB_VAI, TAP_ANIM,XXXXXXX, \
+    XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, RGB_MOD, RGB_HUI, RGB_SAD, RGB_VAD, RGB_RST, XXXXXXX, \
+    XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, XXXXXXX, _______, XXXXXXX \
+  )
+
+};
+
+bool isTapAnim = false;
+
+bool process_record_user(uint16_t keycode, keyrecord_t *record) {
+  switch (keycode) {
+    case RGB_MOD:
+      if (record->event.pressed) {
+        isTapAnim = false;
+      }
+      break;
+    case RGB_RST:
+      #ifdef RGBLIGHT_ENABLE
+        if (record->event.pressed) {
+          eeconfig_update_rgblight_default();
+          rgblight_enable();
+        }
+      #endif
+      break;
+    case TAP_ANIM:
+      if (record->event.pressed) {
+        isTapAnim = !isTapAnim;
+      }
+      break;
+  }
+
+  if (isTapAnim) {
+    rgblight_mode_noeeprom(1);
+    uint16_t hue = (rgblight_config.hue + 5) % 360;
+    rgblight_sethsv_noeeprom(hue, rgblight_config.sat, rgblight_config.val);
+  }
+
+  return true;
+}
+
diff --git a/keyboards/ergo42/keymaps/biacco-underglow/rules.mk b/keyboards/ergo42/keymaps/biacco-underglow/rules.mk
new file mode 100644
index 00000000000..75e9c6503e8
--- /dev/null
+++ b/keyboards/ergo42/keymaps/biacco-underglow/rules.mk
@@ -0,0 +1,5 @@
+ifndef QUANTUM_DIR
+	include ../../../../Makefile
+endif
+
+RGBLIGHT_ENABLE = yes