diff --git a/src/main/kotlin/PluginMain.kt b/src/main/kotlin/PluginMain.kt
index bbaaa32..49bc4e5 100644
--- a/src/main/kotlin/PluginMain.kt
+++ b/src/main/kotlin/PluginMain.kt
@@ -9,14 +9,14 @@ import net.mamoe.mirai.event.events.GroupMessageEvent
 import net.mamoe.mirai.event.subscribeGroupMessages
 import net.mamoe.mirai.utils.info
 import java.text.DecimalFormat
-import java.time.Duration
-import java.time.LocalDateTime
+import java.time.*
+import kotlin.math.max
 
 object PluginMain : KotlinPlugin(
     JvmPluginDescription(
         id = "top.jie65535.j24",
         name = "J 24点游戏",
-        version = "0.1.3"
+        version = "1.0.0"
     ) {
         author("jie65535")
         info("24点游戏")
@@ -27,12 +27,26 @@ object PluginMain : KotlinPlugin(
     private val df = DecimalFormat("0.00")
 
     private const val prefix = "="
+    private const val maxRound = 10
+
+    class GroupState(
+        var lastGameTimes: Int = 1,
+
+        /**
+         * 游戏计时器
+         * 为了防止频繁刷屏，记录开始时间，一定间隔后才可再次触发
+         */
+        var lastStartedAt: LocalDateTime = LocalDateTime.MIN,
+
+        /**
+         * 排行榜计时器
+         * 为了防止频繁刷屏，记录出榜时间，一定间隔后才可再次触发
+         */
+        var lastRankedAt: LocalDateTime = LocalDateTime.MIN
+    )
+
+    private val gameStats = mutableMapOf<Long, GroupState>()
 
-    /**
-     * 排行榜计时器
-     * 为了防止频繁刷屏，记录出榜时间，一定间隔后才可再次触发
-     */
-    private val rankTimes = mutableMapOf<Long, LocalDateTime>()
 
     override fun onEnable() {
         logger.info { "Plugin loaded" }
@@ -45,19 +59,30 @@ object PluginMain : KotlinPlugin(
             .subscribeGroupMessages {
                 "24点" reply {
                     var game = games[group.id]
-                    if (game == null || game.time.plusMinutes(1) < LocalDateTime.now()) {
+                    val state = gameStats.getOrPut(group.id) { GroupState() }
+
+                    if (state.lastStartedAt.plusMinutes(10).isBefore(LocalDateTime.now())) {
+                        state.lastStartedAt = LocalDateTime.now()
+                        state.lastGameTimes = 0
+                    }
+
+                    if (state.lastGameTimes >= maxRound) {
+                        "您参与的太过频繁了，为避免影响他人聊天体验，请稍后再试~"
+                    } else if (game == null || game.time.plusMinutes(1) < LocalDateTime.now()) {
                         game = Point24()
                         games[group.id] = game
-                        "请用 $game 组成结果为24的算式，以'$prefix'开头验证"
+                        state.lastGameTimes++
+                        "{${state.lastGameTimes}/$maxRound} 请用 $game 组成结果为24的算式，以'$prefix'开头验证"
                     } else Unit
                 }
 
-                "24点榜" reply {
-                    val g = PluginData.stats[group.id]
+                "24点榜" reply aaa@{
+                    val g = PluginData.stats[group.id] ?: return@aaa Unit
+                    val state = gameStats.getOrPut(group.id) { GroupState() }
                     // 一小时内仅可查询一次
-                    if (g != null && rankTimes[group.id]?.plusHours(1)?.isBefore(LocalDateTime.now()) != false) {
+                    if (state.lastRankedAt.plusHours(1).isBefore(LocalDateTime.now())) {
                         // 记录查询时间
-                        rankTimes[group.id] = LocalDateTime.now()
+                        state.lastRankedAt = LocalDateTime.now()
                         // 拼接排行榜
                         val sb = StringBuilder()
                         sb.appendLine("[均时榜]")
@@ -80,11 +105,14 @@ object PluginMain : KotlinPlugin(
                     val game = games[group.id]
                     if (game != null) {
                         try {
+                            val now = LocalDateTime.now()
                             val result = game.evaluate(message.contentToString().removePrefix(prefix).trim())
                             if (result == 24.0) {
-                                val newGame = Point24()
-                                games[group.id] = newGame
-                                val duration = Duration.between(game.time, LocalDateTime.now())
+                                val duration = Duration.between(game.time, now)
+//                                    Instant.ofEpochSecond(
+//                                        this.time.toLong())
+//                                        .atZone(ZoneId.systemDefault())
+//                                        .toLocalDateTime())
 
                                 // 群
                                 var g = PluginData.stats[group.id]
@@ -105,18 +133,30 @@ object PluginMain : KotlinPlugin(
                                 if (stat.minTime > t) {
                                     stat.minTime = t
                                 }
-                                // 仅统计百秒内的平均值
-                                if (t < 100) {
+                                // 仅统计一定时间内的均值
+                                val resultText = if (t < 60) {
                                     // 计数增加
                                     stat.count += 1
                                     // 更新均值
-                                    stat.avgTime += (t - stat.avgTime) / stat.count
+                                    stat.avgTime += (t - stat.avgTime) / max(20, stat.count)
 
-                                    "答对了！用时:${df.format(t)}s 平均:${df.format(stat.avgTime)}s 最快:${df.format(stat.minTime)}s\n" +
-                                        "下一题：$newGame"
+                                    "答对了！用时:${df.format(t)}s 平均:${df.format(stat.avgTime)}s 最快:${df.format(stat.minTime)}s\n"
                                 } else {
-                                    "答对了！下一题：$newGame"
+                                    "回答正确！"
                                 }
+
+                                val state = gameStats[group.id]!!
+                                val nextTip = if (state.lastGameTimes >= maxRound) {
+                                    games.remove(group.id)
+                                    "本轮游戏已经结束，感谢参与，请稍作休息~"
+                                } else {
+                                    state.lastGameTimes++
+                                    val newGame = Point24()
+                                    games[group.id] = newGame
+                                    "{${state.lastGameTimes}/$maxRound}下一题：$newGame"
+                                }
+
+                                resultText + nextTip
                             } else {
                                 "答错了，计算结果为 $result"
                             }
diff --git a/src/main/kotlin/Point24.kt b/src/main/kotlin/Point24.kt
index 729552b..5054f26 100644
--- a/src/main/kotlin/Point24.kt
+++ b/src/main/kotlin/Point24.kt
@@ -71,6 +71,7 @@ class Point24 {
         val expr = expression
             .replace('（', '(')
             .replace('）', ')')
+            .replace('X', '*')
             .replace('x', '*')
             .replace('×', '*')
             .replace('÷', '/')