diff --git a/scripts/map_editor.html b/scripts/map_editor.html
index c772a94..c5b8fb3 100644
--- a/scripts/map_editor.html
+++ b/scripts/map_editor.html
@@ -791,7 +791,7 @@ ${paletteStr}"""
                 charInput.value = existing.char;
                 labelInput.value = existing.label;
                 colorInput.value = existing.color;
-                charInput.disabled = true;
+                charInput.disabled = false;
             } else {
                 charInput.value = '';
                 labelInput.value = '';
@@ -802,8 +802,7 @@ ${paletteStr}"""
             form.style.display = 'block';
             form.dataset.editing = existing ? existing.char : '';
 
-            if (!existing) charInput.focus();
-            else labelInput.focus();
+            charInput.focus();
         }
 
         function hidePaletteForm() {
@@ -825,6 +824,30 @@ ${paletteStr}"""
                 if (entry) {
                     entry.label = label;
                     entry.color = color;
+
+                    // If char changed, update grid and symbols
+                    if (char !== editingChar) {
+                        entry.char = char;
+
+                        // Update all cells in grid
+                        for (let y = 0; y < gridHeight; y++) {
+                            for (let x = 0; x < gridWidth; x++) {
+                                if (grid[y][x] === editingChar) {
+                                    grid[y][x] = char;
+                                }
+                            }
+                        }
+
+                        // Update symbols if they match old char
+                        if (symbols.m1 === editingChar) {
+                            symbols.m1 = char;
+                            m1Slot.textContent = char;
+                        }
+                        if (symbols.m2 === editingChar) {
+                            symbols.m2 = char;
+                            m2Slot.textContent = char;
+                        }
+                    }
                 }
             } else {
                 const existing = palette.find(e => e.char === char);