diff --git a/tools/cheat-builder/build.js b/tools/cheat-builder/build.js
index a0f7665..cb31425 100644
--- a/tools/cheat-builder/build.js
+++ b/tools/cheat-builder/build.js
@@ -12,38 +12,41 @@ const format = valid => {
     console.info(`valid rom has ${valid.length}`);
 
     const enc = new TextEncoder();
-    const size = Symbol("length");
+    //const size = Symbol("length");
     const concatUnit = 10240;
     const align = (n, base) => base * Math.floor((n + base - 1) / base);
+    const size = new WeakMap()
     const concat = (a, b) => {
-        let len = (a[size] || 0) + b.length;
+        const sizea = size.get(a);
+        let len = (sizea || 0) + b.length;
         if (len > a.length) {
             let n = new (Object.getPrototypeOf(a).constructor)(align(len, concatUnit) * 2);
             n.set(a, 0);
-            n.set(b, a[size]);
-            n[size] = len;
+            n.set(b, sizea);
+            size.set(n, len);
             return n;
         }
         else {
-            a.set(b, a[size]);
-            a[size] = len;
+            a.set(b, sizea);
+            size.set(a, len);
             return a;
         }
     }
     const getnametable = list => list.reduce((r, { serial, cheat }, idx, arr) => {
         const val = serial.slice(0, -1);
 //console.log("looping", val, r[4], r[2], cheat.length)
+        const size1 = size.get(r[1]);
         if (val != r[4]) {
-            if (r[1][size] > 0 && r[2] - r[1].at(r[1][size] - 1) > r[3])
-                r[3] = r[2] - r[1].at(r[1][size] - 1);
+            if (size1 > 0 && r[2] - r[1].at(size1 - 1) > r[3])
+                r[3] = r[2] - r[1].at(size1 - 1);
             r[0] = concat(r[0], enc.encode(val))
             r[1] = concat(r[1], [r[2]]);
             r[4] = val;
         }
         r[2] = r[2] + cheat.length;
         if (idx + 1 == arr.length) {
-            if (r[2] - r[1].at(r[1][size] - 1) > r[3])
-                r[3] = r[2] - r[1].at(r[1][size] - 1);
+            if (r[2] - r[1].at(size1 - 1) > r[3])
+                r[3] = r[2] - r[1].at(size1 - 1);
             r[1] = concat(r[1], [r[2]]);
         }
         return r;
@@ -52,7 +55,7 @@ const format = valid => {
     const expandcheat = (list, base) => list.reduce((r, { cheat, serial }) => {
         const val = serial.charCodeAt(3);
         return cheat.reduce((r, { id, bin }) => {
-            const off = r[2] + r[1][size];
+            const off = r[2] + size.get(r[1]);
             r[0] = concat(r[0], [val | (off << 3), id])
             r[1] = concat(r[1], bin);
             return r;
@@ -62,7 +65,7 @@ const format = valid => {
     const linkbuffer = (arr, ...l) => {
         for (let i of l) {
             const arrBa = arr[i];
-            arr[i] = arrBa.slice(0, arrBa[size]);
+            arr[i] = arrBa.slice(0, size.get(arrBa));
         }
         return arr;
     }
diff --git a/tools/cheat-builder/cht.js b/tools/cheat-builder/cht.js
index 6602464..ea98d2c 100644
--- a/tools/cheat-builder/cht.js
+++ b/tools/cheat-builder/cht.js
@@ -10,8 +10,9 @@ const NEED_PART = 8
 
 const STATE = ["", "WAIT_LOCK", "READ_LOCK", "WAIT_HOLE", "READ_HOLE", "WAIT_KEY", "READ_KEY"]
 const PASSHOLE = ["text", "off"]
-const space = " ".charCodeAt();
-const tab = "\t".charCodeAt();
+const space = " ";
+const tab = "\t";
+const hex = "0123456789abcdef";
 const zero = "0".charCodeAt();
 const nine = "9".charCodeAt();
 const a = "a".charCodeAt();
@@ -40,8 +41,7 @@ const read = (cht, info, order) => {
 
   let locks = [], currlock = null, retval = [];
 
-  const merge_str = String.fromCharCode.bind(String);
-  const token_str = () => { const r = merge_str.apply(null, token); return (token.length = 0, r); }
+  const token_str = () => { const r = token.join(""); return (token = [], r); }
   const error = msg => { throw new SyntaxError(`${msg} at line: ${line} in lock ${currlock?.name}`) }
   const incr = ch => {
     switch (ch) {
@@ -101,7 +101,7 @@ const read = (cht, info, order) => {
           currlock.keys = [new Array()];
         }
         else if (state == READ_LOCK) {
-          token.push(ch.charCodeAt());
+          token.push(ch);
         }
         else if (state == WAIT_PART) {}
         else if (state == NEED_PART) state = WAIT_PART;
@@ -119,7 +119,7 @@ const read = (cht, info, order) => {
           state = READ_KEY;
         }
         else if (state == READ_LOCK) {
-          token.push(ch.charCodeAt());
+          token.push(ch);
         }
         else if (state == WAIT_PART) {}
         else if (state == NEED_PART) state = WAIT_PART;
@@ -131,7 +131,7 @@ const read = (cht, info, order) => {
           currlock.keys.push(new Array());
         }
         else if (state == READ_LOCK) {
-          token.push(ch.charCodeAt());
+          token.push(ch);
         }
         else if (state == READ_HOLE) {// MULTILINE KEY
           let { name, cmd } = currlock.holes.pop();
@@ -159,29 +159,22 @@ const read = (cht, info, order) => {
         break;
       case " ":
         if (state == READ_LOCK || state == READ_HOLE) {
-          token.push(ch.charCodeAt());
-        }
-        else if (state == READ_KEY) {
-          if (currlock.name.toLowerCase() == "gameinfo") {
-            token.push(ch.charCodeAt());
-          }
+          token.push(ch);
         }
+        else if (state == READ_KEY) {}
         else if (state == WAIT_PART) {}
         else if (state == NEED_PART) state = WAIT_PART;
         break;
       default:
         if (state == READ_LOCK || state == READ_HOLE) {
-          token.push(ch.charCodeAt());
+          token.push(ch);
         }
         else if (state == READ_KEY) {
-          let digit = ch.toLowerCase().charCodeAt();
-          if ((zero <= digit && digit <= nine) ||
-            (a <= digit && digit <= f) ||
-            currlock.name.toLowerCase() == "gameinfo" ||
+          if (hex.includes(ch.toLowerCase()) ||
             currlock.hole.toLowerCase() == "text") {
-            token.push(digit);
+            token.push(ch);
           }
-          else error(`error occur ${ch}[${digit}] on ${STATE[state]}`);
+          else error(`error occur ${ch}[${ch.charCodeAt()}] on ${STATE[state]}`);
         }
         else if (state == WAIT_PART) {}
         else if (state == NEED_PART) state = WAIT_PART;
@@ -218,16 +211,14 @@ const assembleCheat = (list, dup, hole) => {
     else return n;
   };
   const addrval = list.reduce((r, command) => {
-    let [taddr, ...vals] = command;
-    let addr = fromTaddr(taddr);
-    vals.forEach((val, pos) => {
-      let dest = addr + pos;
-      let value = parseInt(val, 16);
-      r.set(dest, value);
-    });
+    let addr = fromTaddr(command[0]);
+    let len = command.length - 1;
+    for( let pos=0; pos < len; ++pos) {
+      r.set(addr+pos, parseInt(command[pos+1], 16))
+    }
     return r;
   }, new Map());
-  const ordered = [...addrval].sort((a, b) => a[0] - b[0]);
+  const ordered = Array.from(addrval).sort((a, b) => a[0] - b[0]);
   const blocks = ordered.reduce((arr, [addr, value]) => {
     dup.set(addr, hole);
     if (arr.length == 0) {
@@ -242,7 +233,11 @@ const assembleCheat = (list, dup, hole) => {
     }
     return arr;
   }, []);
-  return Uint32Array.from(blocks.reduce((r, block) => [...r, block.addr, (block.count << 8) | block.value], []))
+  return Uint32Array.from(blocks.reduce((r, block) => {
+    r.push( block.addr );
+    r.push( (block.count << 8) | block.value )
+    return r;
+  }, []))
 }
 
 const pack = (entlist, strlist, idxlist, cmdlist, xvalue) => {
diff --git a/tools/cheat-builder/worker.js b/tools/cheat-builder/worker.js
index 65458d3..2ecb31f 100644
--- a/tools/cheat-builder/worker.js
+++ b/tools/cheat-builder/worker.js
@@ -1,24 +1,17 @@
 
 const {Worker, isMainThread, parentPort, workerData} = require("worker_threads");
 const readCht = require("./cht");
-const { accessSync, readFileSync } = require("fs");
+const { readFileSync } = require("fs");
 const ncpu = require("os").availableParallelism();
 
 const loadcheat = (order, serial, title, file) => {
-    try{ 
-        accessSync( file );
-    }
-    catch( e ) { 
-        return {serial} 
-    }
-
     try {
         const chtfile = readFileSync(file, {encoding: "utf-8"});
         const cheat = readCht(chtfile, { serial }, order);
         return { serial, cheat }
     }
     catch (e) {
-        console.log("bad cheat: %s[order=%d]\n%s", title, order, e.stack)
+        //console.log("bad cheat: %s[order=%d]\n%s", title, order, e.stack)
         return { serial }
     }
 }