int current_layer = 0;
+/*
+ * Layer0(Default Layer)
+ * ,----------------------------------------------------------.
+ * |Esc| 1| 2| 3| 4| 5| 6| 7| 8| 9| 0| -| =|Backsp|
+ * |----------------------------------------------------------|
+ * |Tab | Q| W| E| R| T| Y| U| I| O| P| [| ]| |
+ * |----------------------------------------------------' |
+ * |Contr| A| S| D| F| G| H| J| K| L| ;| '|Return |
+ * |----------------------------------------------------------|
+ * |Shift | Z| X| C| V| B| N| M| ,| .| /|Shift |Fn2|
+ * |----------------------------------------------------------|
+ * |Fn3|Gui |Alt |Space |Fn1 |Lef|Dow|Up |Rig|
+ * `----------------------------------------------------------'
+ *
+ * Layer1(with Fn1)
+ * ,----------------------------------------------------------.
+ * | `| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Delete|
+ * |----------------------------------------------------------|
+ * | \ | | | | | | | | | | | | | |
+ * |----------------------------------------------------' |
+ * |Contr| | | | | |Lef|Dow|Up |Rig| | | \ |
+ * |----------------------------------------------------------|
+ * |Shift | | | | | |Hom|PgD|PgU|End| |Shift | |
+ * |----------------------------------------------------------|
+ * | |Gui |Alt | |Fn1 |Lef|Dow|Up |Rig|
+ * `----------------------------------------------------------'
+ *
+ * Layer2(with Fn2)
+ * ,----------------------------------------------------------.
+ * | `| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Delete|
+ * |----------------------------------------------------------|
+ * | \ | | | | | | | | | | |Up | | |
+ * |----------------------------------------------------' |
+ * |Contr|VoD|VoU|Mut|F20| | *| /|Hom|PgU|Lef|Rig| \ |
+ * |----------------------------------------------------------|
+ * |Shift | | | | | | +| -|End|PgD|Dow|Shift |Fn2|
+ * |----------------------------------------------------------|
+ * | |Gui |Alt | | |Lef|Dow|Up |Rig|
+ * `----------------------------------------------------------'
+ *
+ * Layer3(with Fn3)
+ * ,----------------------------------------------------------.
+ * | `| F1| F2| F3| F4| F5| F6| F7| F8| F9|F10|F11|F12|Delete|
+ * |----------------------------------------------------------|
+ * | \ | | | | | | | | | | | | | |
+ * |----------------------------------------------------' |
+ * |Contr|Mb1|Mb2|Mb3| | |McL|McD|McU|McR| | | \ |
+ * |----------------------------------------------------------|
+ * |Shift | | | | | |MwL|MwD|MwU|MwR| |Shift | |
+ * |----------------------------------------------------------|
+ * | |Gui |Alt |Mb1 |Mb2 |MsL|MsD|MsU|MsR|
+ * `----------------------------------------------------------'
+ * Mc: Mouse Cursor / Mb: Mouse Button / Mw: Mouse Wheel
+ */
static const uint8_t PROGMEM Keymap[][MATRIX_ROWS][MATRIX_COLS] = {
// 0: default
{