diff --git a/matchmake-extension/protocol.go b/matchmake-extension/protocol.go
index 610f2ad..2307e71 100644
--- a/matchmake-extension/protocol.go
+++ b/matchmake-extension/protocol.go
@@ -37,6 +37,7 @@ func initDefault(c *CommonMatchmakeExtensionProtocol) {
 	c.DefaultProtocol.GetSimplePlayingSession(getSimplePlayingSession)
 	c.DefaultProtocol.AutoMatchmakePostpone(autoMatchmake_Postpone)
 	c.DefaultProtocol.AutoMatchmakeWithSearchCriteriaPostpone(autoMatchmakeWithSearchCriteria_Postpone)
+	c.DefaultProtocol.UpdateProgressScore(updateProgressScore)
 }
 
 func initMarioKart8(c *CommonMatchmakeExtensionProtocol) {
@@ -46,6 +47,7 @@ func initMarioKart8(c *CommonMatchmakeExtensionProtocol) {
 	c.MarioKart8Protocol.GetSimplePlayingSession(getSimplePlayingSession)
 	c.MarioKart8Protocol.AutoMatchmakePostpone(autoMatchmake_Postpone)
 	c.MarioKart8Protocol.AutoMatchmakeWithSearchCriteriaPostpone(autoMatchmakeWithSearchCriteria_Postpone)
+	c.MarioKart8Protocol.UpdateProgressScore(updateProgressScore)
 }
 
 // NewCommonMatchmakeExtensionProtocol returns a new CommonMatchmakeExtensionProtocol
diff --git a/matchmake-extension/update_progress_score.go b/matchmake-extension/update_progress_score.go
new file mode 100644
index 0000000..7575813
--- /dev/null
+++ b/matchmake-extension/update_progress_score.go
@@ -0,0 +1,58 @@
+package matchmake_extension
+
+import (
+	nex "github.com/PretendoNetwork/nex-go"
+	common_globals "github.com/PretendoNetwork/nex-protocols-common-go/globals"
+	matchmake_extension "github.com/PretendoNetwork/nex-protocols-go/matchmake-extension"
+)
+
+func updateProgressScore(err error, client *nex.Client, callID uint32, gid uint32, progressScore uint8) uint32 {
+	if err != nil {
+		logger.Error(err.Error())
+		return nex.Errors.Core.InvalidArgument
+	}
+
+	session := common_globals.Sessions[gid]
+	if session == nil {
+		return nex.Errors.RendezVous.SessionVoid
+	}
+
+	if progressScore > 100 {
+		return nex.Errors.Core.InvalidArgument
+	}
+
+	if session.GameMatchmakeSession.Gathering.OwnerPID != client.PID() {
+		return nex.Errors.RendezVous.PermissionDenied
+	}
+
+	session.GameMatchmakeSession.ProgressScore += progressScore
+
+	server := commonMatchmakeExtensionProtocol.server
+
+	rmcResponse := nex.NewRMCResponse(matchmake_extension.ProtocolID, callID)
+	rmcResponse.SetSuccess(matchmake_extension.MethodUpdateProgressScore, nil)
+
+	rmcResponseBytes := rmcResponse.Bytes()
+
+	var responsePacket nex.PacketInterface
+
+	if server.PRUDPVersion() == 0 {
+		responsePacket, _ = nex.NewPacketV0(client, nil)
+		responsePacket.SetVersion(0)
+	} else {
+		responsePacket, _ = nex.NewPacketV1(client, nil)
+		responsePacket.SetVersion(1)
+	}
+
+	responsePacket.SetSource(0xA1)
+	responsePacket.SetDestination(0xAF)
+	responsePacket.SetType(nex.DataPacket)
+	responsePacket.SetPayload(rmcResponseBytes)
+
+	responsePacket.AddFlag(nex.FlagNeedsAck)
+	responsePacket.AddFlag(nex.FlagReliable)
+
+	server.Send(responsePacket)
+
+	return 0
+}