diff --git a/frontend/src/components/CodeEditor.vue b/frontend/src/components/CodeEditor.vue
index 6b30156..9364bdd 100644
--- a/frontend/src/components/CodeEditor.vue
+++ b/frontend/src/components/CodeEditor.vue
@@ -57,7 +57,7 @@ function hl(line) {
   let h = line.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;')
   h = h.replace(/(;.*)$/, '<span class="sc">$1</span>')
   h = h.replace(/^(\s*\w+\s*:)/, '<span class="sl">$1</span>')
-  h = h.replace(/\b(MOV|ADD|SUB|MUL|DIV|MOD|AND|ORR|EOR|MVN|LSL|LSR|CMP|BEQ|BNE|BGT|BLT|BGE|BLE|LDR|STR|PUSH|POP|OUT|HLT|NOP|B)\b/gi,
+  h = h.replace(/\b(MOV|ADD|SUB|MUL|XDIV|XMOD|AND|ORR|EOR|MVN|LSL|LSR|CMP|BEQ|BNE|BGT|BLT|BGE|BLE|LDR|STR|PUSH|POP|XOUT|XHLT|NOP|B)\b/gi,
     '<span class="sk">$1</span>')
   h = h.replace(/\b(R[0-7])\b/gi, '<span class="sr">$1</span>')
   h = h.replace(/(\[[^\]]+\])/g, '<span class="sm">$1</span>')
diff --git a/frontend/src/lib/levels/01.yaml b/frontend/src/lib/levels/01.yaml
index 4056f29..c57e185 100644
--- a/frontend/src/lib/levels/01.yaml
+++ b/frontend/src/lib/levels/01.yaml
@@ -14,12 +14,12 @@ tutorial:
     code: |
       MOV R0, #42    ; 把 42 放进 R0
       MOV R1, #100   ; 把 100 放进 R1
-  - title: HLT 指令
+  - title: XHLT 指令
     text: >
-      程序最后要写 `HLT`（halt = 停止），告诉机器"运行结束！"
+      程序最后要写 `XHLT`（halt = 停止），告诉机器"运行结束！"
     code: |
       MOV R0, #42
-      HLT
+      XHLT
 
 goal: 把数字 **42** 放进 **R0** 寄存器
 
@@ -34,7 +34,7 @@ testCases:
 hints:
   - "MOV 的格式：MOV 寄存器, #数字"
   - "试试：MOV R0, #???"
-  - "答案：MOV R0, #42 然后 HLT"
+  - "答案：MOV R0, #42 然后 XHLT"
 
 starThresholds: [2, 3, 5]
 
@@ -43,6 +43,6 @@ starterCode: |
   ; 提示：数字前面要加 # 号
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/02.yaml b/frontend/src/lib/levels/02.yaml
index 57f9d54..a8f1ec3 100644
--- a/frontend/src/lib/levels/02.yaml
+++ b/frontend/src/lib/levels/02.yaml
@@ -30,7 +30,7 @@ testCases:
 hints:
   - "MOV 寄存器, 寄存器 —— 把右边复制到左边"
   - "MOV R1, R0 可以把 R0 复制到 R1"
-  - "答案：MOV R1, R0 / MOV R2, R0 / HLT"
+  - "答案：MOV R1, R0 / MOV R2, R0 / XHLT"
 
 starThresholds: [3, 4, 6]
 
@@ -39,6 +39,6 @@ starterCode: |
   ; 把 R0 复制到 R1 和 R2
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/03.yaml b/frontend/src/lib/levels/03.yaml
index 8f4d9ee..99e5ca5 100644
--- a/frontend/src/lib/levels/03.yaml
+++ b/frontend/src/lib/levels/03.yaml
@@ -38,7 +38,7 @@ testCases:
 hints:
   - "ADD 第一个参数放结果，后两个参数相加"
   - "ADD R2, R0, R1 —— 结果存入 R2"
-  - "答案：ADD R2, R0, R1 / HLT"
+  - "答案：ADD R2, R0, R1 / XHLT"
 
 starThresholds: [2, 3, 5]
 
@@ -47,6 +47,6 @@ starterCode: |
   ; 计算 R0 + R1，结果存入 R2
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/04.yaml b/frontend/src/lib/levels/04.yaml
index 33e4268..354308f 100644
--- a/frontend/src/lib/levels/04.yaml
+++ b/frontend/src/lib/levels/04.yaml
@@ -1,7 +1,7 @@
 id: 4
 title: 乘法与除法
 subtitle: 更强的算术能力
-description: 学习 MUL 和 DIV 指令
+description: 学习 MUL 和 XDIV 指令
 
 tutorial:
   - title: MUL —— 乘法
@@ -11,13 +11,13 @@ tutorial:
       MOV R0, #6
       MOV R1, #7
       MUL R2, R0, R1    ; R2 = 6 × 7 = 42
-  - title: DIV —— 除法（取整）
+  - title: XDIV —— 除法（取整）
     text: >
-      DIV 做整数除法（只留整数部分）：
+      XDIV 做整数除法（只留整数部分）：
     code: |
       MOV R0, #100
       MOV R1, #4
-      DIV R2, R0, R1    ; R2 = 100 ÷ 4 = 25
+      XDIV R2, R0, R1    ; R2 = 100 ÷ 4 = 25
 
 goal: 计算 **6 × 7** 存入 R0，**100 ÷ 4** 存入 R1
 
@@ -31,9 +31,9 @@ testCases:
         R1: 25
 
 hints:
-  - "先 MOV 数字到寄存器，再 MUL/DIV"
+  - "先 MOV 数字到寄存器，再 MUL/XDIV"
   - "MUL R0, R2, R3 可以把 R2×R3 的结果放到 R0"
-  - "答案：MOV R2, #6 / MOV R3, #7 / MUL R0, R2, R3 / MOV R2, #100 / MOV R3, #4 / DIV R1, R2, R3 / HLT"
+  - "答案：MOV R2, #6 / MOV R3, #7 / MUL R0, R2, R3 / MOV R2, #100 / MOV R3, #4 / XDIV R1, R2, R3 / XHLT"
 
 starThresholds: [7, 9, 12]
 
@@ -42,6 +42,6 @@ starterCode: |
   ; 计算 100÷4 存入 R1
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/05.yaml b/frontend/src/lib/levels/05.yaml
index 7eba1b6..9842464 100644
--- a/frontend/src/lib/levels/05.yaml
+++ b/frontend/src/lib/levels/05.yaml
@@ -43,7 +43,7 @@ testCases:
 hints:
   - "AND 用来保留某些位，把其他位清零"
   - "低4位的掩码是 15（二进制 00001111）"
-  - "答案：AND R0, R0, #15 / HLT"
+  - "答案：AND R0, R0, #15 / XHLT"
 
 starThresholds: [2, 3, 5]
 
@@ -52,6 +52,6 @@ starterCode: |
   ; 用 AND 提取低4位
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/06.yaml b/frontend/src/lib/levels/06.yaml
index e7e8079..03e4d1c 100644
--- a/frontend/src/lib/levels/06.yaml
+++ b/frontend/src/lib/levels/06.yaml
@@ -41,13 +41,13 @@ hints:
   - "就这一条指令！"
 
 starThresholds: [2, 3, 5]
-blockedOps: [MUL, DIV]
+blockedOps: [MUL, XDIV]
 
 starterCode: |
   ; R0 = 5
   ; 用 LSL 让 R0 变成 40（不能用 MUL）
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/07.yaml b/frontend/src/lib/levels/07.yaml
index ae3970f..1d2fff1 100644
--- a/frontend/src/lib/levels/07.yaml
+++ b/frontend/src/lib/levels/07.yaml
@@ -43,7 +43,7 @@ testCases:
 hints:
   - "先用 LDR 把内存值读到寄存器，算完用 STR 写回"
   - "MOV R3, #0 设基地址，LDR R0, [R3, #0] 读第一个值"
-  - "答案：MOV R3, #0 / LDR R0, [R3, #0] / LDR R1, [R3, #1] / ADD R2, R0, R1 / STR R2, [R3, #2] / HLT"
+  - "答案：MOV R3, #0 / LDR R0, [R3, #0] / LDR R1, [R3, #1] / ADD R2, R0, R1 / STR R2, [R3, #2] / XHLT"
 
 starThresholds: [6, 8, 10]
 
@@ -55,7 +55,7 @@ starterCode: |
   ; 然后用 LDR/STR 读写内存
 
 
-  HLT
+  XHLT
 
 showMemory: true
 memoryRange: [0, 15]
diff --git a/frontend/src/lib/levels/08.yaml b/frontend/src/lib/levels/08.yaml
index bc968dd..e960edf 100644
--- a/frontend/src/lib/levels/08.yaml
+++ b/frontend/src/lib/levels/08.yaml
@@ -32,7 +32,7 @@ tutorial:
       big:
       MOV R1, #1     ; R0 > 10
       done:
-      HLT
+      XHLT
 
 goal: R0=**15**。如果 R0 > 10 则 R1 = **1**；否则 R1 = **0**
 
@@ -63,7 +63,7 @@ testCases:
 hints:
   - "先设 R1=#0（默认），再比较 R0 和 10"
   - "如果 R0 > 10，跳到标签把 R1 改成 1"
-  - "答案：MOV R1, #0 / CMP R0, #10 / BLE done / MOV R1, #1 / done: HLT"
+  - "答案：MOV R1, #0 / CMP R0, #10 / BLE done / MOV R1, #1 / done: XHLT"
 
 starThresholds: [5, 7, 9]
 
@@ -72,6 +72,6 @@ starterCode: |
   ; 否则 R1 = 0
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/09.yaml b/frontend/src/lib/levels/09.yaml
index 26ee9d0..28e1683 100644
--- a/frontend/src/lib/levels/09.yaml
+++ b/frontend/src/lib/levels/09.yaml
@@ -16,7 +16,7 @@ tutorial:
         ADD R4, R4, #1  ; ②③ 计数+1
         CMP R4, #5      ; ④ 到5了吗？
         BLE loop         ; 没到就跳回
-      HLT
+      XHLT
   - title: 注意！
     text: >
       忘了更新计数器 = **死循环**（别担心，超过10000步会自动停止）。
@@ -34,7 +34,7 @@ testCases:
 hints:
   - "R0 累加结果，R4 做计数器（1到10）"
   - "循环体：ADD R0, R0, R4 / ADD R4, R4, #1 / CMP R4, #10 / BLE loop"
-  - "完整：MOV R0, #0 / MOV R4, #1 / loop: ADD R0, R0, R4 / ADD R4, R4, #1 / CMP R4, #10 / BLE loop / HLT"
+  - "完整：MOV R0, #0 / MOV R4, #1 / loop: ADD R0, R0, R4 / ADD R4, R4, #1 / CMP R4, #10 / BLE loop / XHLT"
 
 starThresholds: [7, 9, 12]
 
@@ -45,6 +45,6 @@ starterCode: |
   ; 提示：用一个寄存器做计数器
 
 
-  HLT
+  XHLT
 
 showMemory: false
diff --git a/frontend/src/lib/levels/10.yaml b/frontend/src/lib/levels/10.yaml
index 74fea42..ecda51a 100644
--- a/frontend/src/lib/levels/10.yaml
+++ b/frontend/src/lib/levels/10.yaml
@@ -75,7 +75,7 @@ starterCode: |
   ; 用 MOV + LDR 读取内存
 
 
-  HLT
+  XHLT
 
 showMemory: true
 memoryRange: [0, 15]
diff --git a/frontend/src/lib/vm.js b/frontend/src/lib/vm.js
index a96b9c4..f4d315c 100644
--- a/frontend/src/lib/vm.js
+++ b/frontend/src/lib/vm.js
@@ -1,9 +1,9 @@
 const REGISTERS = ['R0','R1','R2','R3','R4','R5','R6','R7']
 const OPCODES = [
-  'MOV','ADD','SUB','MUL','DIV','MOD',
+  'MOV','ADD','SUB','MUL','XDIV','XMOD',
   'AND','ORR','EOR','MVN','LSL','LSR',
   'CMP','B','BEQ','BNE','BGT','BLT','BGE','BLE',
-  'LDR','STR','PUSH','POP','OUT','HLT','NOP',
+  'LDR','STR','PUSH','POP','XOUT','XHLT','NOP',
 ]
 const BRANCH_OPS = ['B','BEQ','BNE','BGT','BLT','BGE','BLE']
 const MAX_STEPS = 10000
@@ -198,7 +198,7 @@ export function createVM() {
     try {
       switch (opcode) {
         case 'NOP': break
-        case 'HLT': state.halted = true; break
+        case 'XHLT': state.halted = true; break
 
         case 'MOV':
           setReg(ops[0], getVal(ops[1]), changes)
@@ -207,11 +207,11 @@ export function createVM() {
         case 'ADD': { const r = arith3(ops, (a,b) => a+b); state.flags.carry = r > 0xFFFF; setReg(ops[0], r, changes); updateFlags(r); break }
         case 'SUB': { const r = arith3(ops, (a,b) => a-b); state.flags.carry = r < 0; setReg(ops[0], r, changes); updateFlags(r); break }
         case 'MUL': { const r = arith3(ops, (a,b) => a*b); state.flags.carry = r > 0xFFFF; setReg(ops[0], r, changes); updateFlags(r); break }
-        case 'DIV': {
+        case 'XDIV': {
           const r = arith3(ops, (a,b) => { if(b===0) throw new Error('除以零！'); return Math.floor(a/b) })
           setReg(ops[0], r, changes); updateFlags(r); break
         }
-        case 'MOD': {
+        case 'XMOD': {
           const r = arith3(ops, (a,b) => { if(b===0) throw new Error('除以零！'); return a%b })
           setReg(ops[0], r, changes); updateFlags(r); break
         }
@@ -274,7 +274,7 @@ export function createVM() {
           break
         }
 
-        case 'OUT': {
+        case 'XOUT': {
           const v = getVal(ops[0])
           state.output.push(v)
           changes.push({ type: 'output', val: v })