diff --git a/sketches/assembler.js b/sketches/assembler.js
index e3374d0..badc7d4 100644
--- a/sketches/assembler.js
+++ b/sketches/assembler.js
@@ -10,7 +10,6 @@
 
 const printMemory = require('./print-memory.js');
 
-const { debug } = require("console");
 
 // 0 = silent
 // 1 = verbose
@@ -41,8 +40,6 @@ function decodeInstructions(str) {
     console.group(`Input line ${i}, cursor ${byteCursor}`);
     dbg(3, `> ${lines[i]}`);
     let line = stripWhitespaceFromEnds(stripComments(lines[i]));
-    // console.log();
-    // console.log(`> ${line}`);
 
     // Handle blank lines
     if (line.length === 0) {
@@ -66,11 +63,8 @@ function decodeInstructions(str) {
           bytesToReplace: [],
         };
       }
-
-      dbg(2, '');
-      dbg(2, `@label anchor: ${label}`);
-      dbg(2, labels);
-      dbg(2, '');
+      dbg(2, `pointsToByte: ${labels[label].pointsToByte}`);
+      dbg(2, `bytesToReplace: ${labels[label].bytesToReplace}`);
       dbg(3, `cursor: ${byteCursor}, new code: none`);
       console.groupEnd('Input line');
       continue;
@@ -94,11 +88,8 @@ function decodeInstructions(str) {
       // TODO: validate label // validateLabel(line);
       label = arg_str.substring(1); // strip '@'
       arg_num = 0;
-      dbg(2, '');
-      dbg(2, `@label reference: ${label}`);
 
       if (label in labels) {
-        dbg(2, '');
         dbg(1, `'${label}' already in labels object`);
         labels[label].bytesToReplace.push(byteCursor + 1);
       } else {
@@ -107,11 +98,8 @@ function decodeInstructions(str) {
           bytesToReplace: [byteCursor + 1],
         };
       }
-      // dbg(2, labels);
-      dbg(2, `label pointsToByte: ${labels[label].pointsToByte}`);
-      dbg(2, `label bytesToReplace: ${labels[label].bytesToReplace}`);
-
-      dbg(2, '');
+      dbg(2, `pointsToByte: ${labels[label].pointsToByte}`);
+      dbg(2, `bytesToReplace: ${labels[label].bytesToReplace}`);
     } else if (arg_str.startsWith("(")) {
       // Handle indirect expressions
       addressingMode = "indirect";
@@ -137,12 +125,18 @@ function decodeInstructions(str) {
     console.groupEnd('Input line');
   };
 
-  printMemory.printTable(machineCode);
+  dbg(2, '');
+  dbgGroup(2, 'Memory before filling in label pointers');
+  dbgExec(2, () => printMemory.printTable(machineCode));
+  dbgGroupEnd(2, 'Memory before filling in label pointers');
 
   // Backfill label pointers
   for (let k of Object.keys(labels)) {
+    dbgGroup(2, `@${k}`);
     let label = labels[k];
-    dbg(2, label);
+    dbg(2, `pointsToByte: ${label.pointsToByte}`);
+    dbg(2, `bytesToReplace: ${label.bytesToReplace}`);
+    dbgGroupEnd(2, `label`);
     for (let j = 0; j < label.bytesToReplace.length; j++) {
       machineCode[label.bytesToReplace[j]] = label.pointsToByte;
     }
@@ -164,9 +158,11 @@ function stripWhitespaceFromEnds(line) {
 
 function hex2num(hex) { return parseInt(hex, 16) };
 
-function dbg(debugLevel, string) {
-  if (debugLevel >= DEBUG) console.log(string);
-}
+// Debug helpers
+const dbg = (lvl, s) => { if (lvl >= DEBUG) console.log(s) };
+const dbgGroup = (lvl, s) => { if (lvl >= DEBUG) console.group(s) };
+const dbgGroupEnd = (lvl, s) => { if (lvl >= DEBUG) console.groupEnd(s) };
+const dbgExec = (lvl, func) => { if (lvl >= DEBUG) func(); }
 
 // RUN IT