diff --git a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotFreezeBurn.kt b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotFreezeBurn.kt
new file mode 100644
index 0000000..6bddd67
--- /dev/null
+++ b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotFreezeBurn.kt
@@ -0,0 +1,46 @@
+package cn.rdlevel.rdkt.core.data
+
+import kotlin.jvm.JvmStatic
+
+/**
+ * Represents the freeze or burn modifier applied to a oneshot pulse.
+ * Used in [cn.rdlevel.rdkt.core.events.AddOneshotBeatEvent].
+ */
+public sealed class OneshotFreezeBurn(public val type: String) {
+    /**
+     * Neither freeze nor burn modifier is applied to the oneshot pulse.
+     */
+    public data object None : OneshotFreezeBurn("None")
+
+    /**
+     * The oneshot pulse is frozen and the actual hit point is delayed for a certain duration.
+     *
+     * @param delay The duration of the delay in beats.
+     */
+    public data class Freezeshot(val delay: Double) : OneshotFreezeBurn("Freezeshot")
+
+    /**
+     * The oneshot pulse is burned and the actual hit point is advanced by a certain duration.
+     */
+    public data object Burnshot : OneshotFreezeBurn("Burnshot")
+
+    public companion object {
+        /**
+         * Returns an instance of [None], indicating that neither freeze nor burn modifier is applied to the oneshot pulse.
+         */
+        @JvmStatic
+        public fun none(): None = None
+
+        /**
+         * Returns an instance of [Freezeshot] with the specified delay, indicating that the oneshot pulse is frozen and the actual hit point is delayed for the given duration.
+         */
+        @JvmStatic
+        public fun freezeshot(delay: Double): Freezeshot = Freezeshot(delay)
+
+        /**
+         * Returns an instance of [Burnshot], indicating that the oneshot pulse is burned and the actual hit point is advanced by a certain duration.
+         */
+        @JvmStatic
+        public fun burnshot(): Burnshot = Burnshot
+    }
+}
\ No newline at end of file
diff --git a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotHold.kt b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotHold.kt
new file mode 100644
index 0000000..baab79f
--- /dev/null
+++ b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotHold.kt
@@ -0,0 +1,63 @@
+package cn.rdlevel.rdkt.core.data
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlin.jvm.JvmOverloads
+import kotlin.jvm.JvmStatic
+
+/**
+ * Represents the hold settings of a oneshot pulse.
+ * Used in [cn.rdlevel.rdkt.core.events.AddOneshotBeatEvent].
+ */
+public sealed class OneshotHold {
+    /**
+     * The oneshot pulse is not holdshot.
+     */
+    public data object Off : OneshotHold()
+
+    /**
+     * The oneshot pulse is holdshot.
+     *
+     * @property cueType The type of the holdshot cue.
+     */
+    public data class On(var cueType: CueType = CueType.AUTO) : OneshotHold()
+
+    /**
+     * Represents when the holdshot cue is cued.
+     */
+    @Serializable
+    public enum class CueType {
+        /**
+         * The time of holdshot cue is automatically determined.
+         */
+        @SerialName("Auto")
+        AUTO,
+
+        /**
+         * The cue is cued on the end of the previous oneshot.
+         */
+        @SerialName("Early")
+        EARLY,
+
+        /**
+         * The cue is cued on the start of the pulse of the holdshot.
+         */
+        @SerialName("Late")
+        LATE,
+    }
+
+    public companion object {
+        /**
+         * Returns an instance of [Off], indicating that the oneshot pulse is not holdshot.
+         */
+        @JvmStatic
+        public fun off(): Off = Off
+
+        /**
+         * Returns an instance of [On] with the specified cue type, indicating that the oneshot pulse is holdshot with the given cue type.
+         */
+        @JvmStatic
+        @JvmOverloads
+        public fun on(cueType: CueType = CueType.AUTO): On = On(cueType)
+    }
+}
\ No newline at end of file
diff --git a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotPulse.kt b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotPulse.kt
new file mode 100644
index 0000000..2e60a10
--- /dev/null
+++ b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/data/OneshotPulse.kt
@@ -0,0 +1,99 @@
+package cn.rdlevel.rdkt.core.data
+
+import kotlin.jvm.JvmOverloads
+import kotlin.jvm.JvmStatic
+
+/**
+ * Represents a oneshot pulse with its settings.
+ * Used in [cn.rdlevel.rdkt.core.events.AddOneshotBeatEvent].
+ */
+public sealed class OneshotPulse(
+    public val pulseType: String,
+) {
+    /**
+     * The number of subdivisions for the pulse. Must be between 1 and 10.
+     * For normal waves this is defaulted to 1.
+     */
+    public abstract val subdivisions: Int
+
+    /**
+     * Represent a oneshot that can have subdivisions and sound settings.
+     *
+     * @property sound Whether the pulse should have special sounds. Default is true.
+     */
+    public sealed class OneshotSubdivisionPulse(
+        pulseType: String,
+        public var sound: Boolean = true
+    ) : OneshotPulse(pulseType)
+
+    /**
+     * Represents a simple oneshot pulse without subdivisions or sound settings.
+     */
+    public object Wave : OneshotPulse("Wave") {
+        override val subdivisions: Int
+            get() = 1
+    }
+
+    /**
+     * Represents a heart-shaped oneshot pulse without subdivisions or sound settings.
+     */
+    public object Heart : OneshotPulse("Heart") {
+        override val subdivisions: Int
+            get() = 1
+    }
+
+    /**
+     * Represents a oneshot pulse with a single subdivision (squareshot) and sound settings.
+     */
+    public class Square(sound: Boolean) : OneshotSubdivisionPulse("Square", sound) {
+        override val subdivisions: Int
+            get() = 1
+    }
+
+    /**
+     * Represents a oneshot pulse with multiple subdivisions (triangleshot) and sound settings.
+     */
+    public class Triangle(subdivisions: Int, sound: Boolean) : OneshotSubdivisionPulse("Triangle", sound) {
+        override var subdivisions: Int = subdivisions
+            set(value) {
+                require(value in 1..10) { "Subdivisions must be between 1 and 10." }
+                field = value
+            }
+
+        init {
+            this.subdivisions = subdivisions
+        }
+    }
+
+    public companion object {
+        /**
+         * Returns a [Wave] oneshot pulse, which has no subdivisions or sound settings.
+         */
+        @JvmStatic
+        public fun wave(): Wave = Wave
+
+        /**
+         * Returns a [Heart] oneshot pulse, which has no subdivisions or sound settings.
+         */
+        public fun heart(): Heart = Heart
+
+        /**
+         * Returns either a [Square] or a [Triangle] based on the number of subdivisions.
+         */
+        @JvmStatic
+        @JvmOverloads
+        public fun subdivision(subdivisions: Int, sound: Boolean = true): OneshotSubdivisionPulse =
+            when (subdivisions) {
+                1 -> Square(sound)
+                in 2..10 -> Triangle(subdivisions, sound)
+                else -> throw IllegalArgumentException("Subdivisions must be between 1 and 10.")
+            }
+
+        internal fun from(type: String, subdivisions: Int, sound: Boolean): OneshotPulse = when (type) {
+            "Wave" -> wave()
+            "Square" -> subdivision(1, sound)
+            "Triangle" -> subdivision(subdivisions, sound)
+            else -> throw IllegalArgumentException("Unknown pulse type: $type")
+        }
+    }
+}
\ No newline at end of file
diff --git a/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/events/AddOneshotBeatEvent.kt b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/events/AddOneshotBeatEvent.kt
new file mode 100644
index 0000000..dab92fe
--- /dev/null
+++ b/core/src/commonMain/kotlin/cn/rdlevel/rdkt/core/events/AddOneshotBeatEvent.kt
@@ -0,0 +1,141 @@
+@file:OptIn(RDKTInternalAPI::class)
+
+package cn.rdlevel.rdkt.core.events
+
+
+import cn.rdlevel.rdkt.core.annotations.RDKTInternalAPI
+import cn.rdlevel.rdkt.core.data.OneshotFreezeBurn
+import cn.rdlevel.rdkt.core.data.OneshotHold
+import cn.rdlevel.rdkt.core.data.OneshotPulse
+import cn.rdlevel.rdkt.core.serialization.TransformSerializer
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlin.jvm.JvmStatic
+
+/**
+ * Adds a oneshot pulse to the specific row.
+ *
+ * @property pulse The type of the oneshot pulse to be added.
+ * @property freezeBurnMode The freeze or burn modifier applied to the oneshot pulse.
+ * @property hold The hold behavior of the oneshot pulse.
+ * @property skip Whether the oneshot pulse is a skipshot.
+ */
+@Serializable(AddOneshotBeatEvent.Serializer::class)
+@SerialName("AddOneshotBeat")
+public data class AddOneshotBeatEvent(
+    var pulse: OneshotPulse = OneshotPulse.Wave,
+    var freezeBurnMode: OneshotFreezeBurn = OneshotFreezeBurn.None,
+    var hold: OneshotHold = OneshotHold.Off,
+    var skip: Boolean = false,
+) : RowEvent() {
+    /**
+     * The time between the pulse appears and the actual hit point in beats.
+     * Must be non-negative.
+     */
+    var tick: Double = 1.0
+        set(value) {
+            require(value >= 0) { "Tick must be non-negative." }
+            field = value
+        }
+
+    /**
+     * The interval between every two hits with normal looped oneshots in beats.
+     * Must be non-negative.
+     * This value is only used if this is a skipshot, freezeshot, burnshot, holdshot, or [loops] is positive.
+     */
+    var interval: Double = 2.0
+        set(value) {
+            require(value >= 0) { "Interval must be non-negative." }
+            field = value
+        }
+
+    /**
+     * How many repetitions of the oneshot pattern will create. Must be non-negative.
+     * Setting this to 0 means the oneshot will only occur once.
+     */
+    var loops: Int = 0
+        set(value) {
+            require(value >= 0) { "Loops must be non-negative." }
+            field = value
+        }
+
+    public object Serializer :
+        TransformSerializer<AddOneshotBeatEvent, Serializer.Data>("AddOneshotBeat", Data.serializer()) {
+        override fun toData(value: AddOneshotBeatEvent): Data {
+            return Data.fromBase(value).apply {
+                pulseType = value.pulse.pulseType
+                freezeBurnMode = value.freezeBurnMode.type
+                interval = value.interval
+                tick = value.tick
+                delay = (value.freezeBurnMode as? OneshotFreezeBurn.Freezeshot)?.delay
+                loops = value.loops
+                subdivisions = value.pulse.subdivisions
+                subdivSound = (value.pulse as? OneshotPulse.OneshotSubdivisionPulse)?.sound
+                skipshot = value.skip
+                hold = value.hold is OneshotHold.On
+                holdCue = (value.hold as? OneshotHold.On)?.cueType
+            }
+        }
+
+        override fun fromData(data: Data): AddOneshotBeatEvent {
+            val pulse = OneshotPulse.from(data.pulseType, data.subdivisions, data.subdivSound ?: true)
+            val freezeBurnMode = when (data.freezeBurnMode) {
+                "None", null -> OneshotFreezeBurn.None
+                "Freezeshot" -> OneshotFreezeBurn.Freezeshot(
+                    data.delay ?: error("Delay must be provided for Freezeshot mode.")
+                )
+
+                "Burnshot" -> OneshotFreezeBurn.Burnshot
+                else -> throw IllegalArgumentException("Unknown freeze/burn mode: ${data.freezeBurnMode}")
+            }
+            val hold = if (data.hold == true) {
+                OneshotHold.On(data.holdCue ?: OneshotHold.CueType.AUTO)
+            } else {
+                OneshotHold.Off
+            }
+            return AddOneshotBeatEvent(
+                pulse = pulse,
+                freezeBurnMode = freezeBurnMode,
+                hold = hold,
+                skip = data.skipshot ?: false,
+            ).apply {
+                copyBaseFrom(data)
+                this.interval = data.interval
+                this.tick = data.tick
+                this.loops = data.loops
+            }
+        }
+
+        @Serializable
+        @RDKTInternalAPI
+        public data class Data(
+            var pulseType: String = "",
+            var freezeBurnMode: String? = null,
+            var interval: Double = 2.0,
+            var tick: Double = 1.0,
+            var delay: Double? = 0.5,
+            var loops: Int = 0,
+            var subdivisions: Int = 0,
+            var subdivSound: Boolean? = true,
+            var skipshot: Boolean? = false,
+            var hold: Boolean? = false,
+            var holdCue: OneshotHold.CueType? = OneshotHold.CueType.AUTO,
+        ) : RowEvent() {
+            public companion object {
+                public fun fromBase(other: RowEvent): Data {
+                    return Data().apply { copyBaseFrom(other) }
+                }
+            }
+        }
+    }
+
+    public companion object {
+        /**
+         * Creates a new [AddOneshotBeatEvent] using the provided block to configure its properties.
+         */
+        @JvmStatic
+        public fun of(block: AddOneshotBeatEvent.() -> Unit): AddOneshotBeatEvent {
+            return AddOneshotBeatEvent().apply(block)
+        }
+    }
+}
\ No newline at end of file