diff --git a/.hgignore b/.gitignore
similarity index 100%
rename from .hgignore
rename to .gitignore
diff --git a/Enemies.cpp b/Enemies.cpp
index 82dd836..80204fb 100644
--- a/Enemies.cpp
+++ b/Enemies.cpp
@@ -64,7 +64,7 @@ void Enemies::Update() {
 	if (betweenWaves > 0) {
 		betweenWaves--;
 		if (betweenWaves < 240) {
-			char waveText[7] = "WAVE 0"; waveText[5] = wave + 48;
+			char waveText[12] = "TABLA DEL 0"; waveText[10] = 1+wave + 48;
 			Print(200, 120, waveText, 255, 255, 255);
 		}
 	} else {
@@ -108,7 +108,7 @@ void Enemies::Update() {
 	}
 }
 
-void CheckEnemyHit(int n1, int n2) {
+int CheckEnemyHit(int n1, int n2) {
 	for (int i = 0; i < MAX_ENEMIES; i++) {
 		if (enemies[i].y > -1) {
 			if (enemies[i].m1 * enemies[i].m2 == n1 * 10 + n2) {
@@ -121,15 +121,17 @@ void CheckEnemyHit(int n1, int n2) {
 				if (kills == 16) {
 					betweenWaves = 360; wave++; ResetEnemies();
 				}
+				return 1;
 			}
 		}
 	}
+	return 0;
 }
 
 void Enemies::ProcessMessage(const char* msg) {
 	if (msg == "CheckEnemyHit") {
 		int* params = GetMessageParams();
-		CheckEnemyHit(params[0], params[1]);
+		SetMessageReturn(CheckEnemyHit(params[0], params[1]));
 	} else if (msg == "ResetEnemies") {
 		betweenWaves = 420; ResetEnemies();
 	}
diff --git a/api.cpp b/api.cpp
index 4509081..5bf0461 100644
--- a/api.cpp
+++ b/api.cpp
@@ -16,6 +16,7 @@ std::vector<System*> systems;
 std::vector<std::string> msgTexts;
 std::vector<System*> msgSystems;
 int msgParams[5];
+int msgReturn;
 bool reseted = false;
 bool anyKey = false;
 
@@ -191,3 +192,11 @@ void SendMessage(const char* msg, int p1, int p2, int p3, int p4, int p5) {
 int* GetMessageParams() {
 	return msgParams;
 }
+
+int GetMessageReturn() {
+	return msgReturn;
+}
+
+void SetMessageReturn(int value) {
+	msgReturn = value;
+}
diff --git a/api.h b/api.h
index f90de1a..4591743 100644
--- a/api.h
+++ b/api.h
@@ -47,3 +47,5 @@ void RegisterMessage(const char* msg, System* handler);
 void SendMessage(const char* msg, int p1 = 0, int p2 = 0, int p3 = 0, int p4 = 0, int p5 = 0);
 
 int* GetMessageParams();
+int GetMessageReturn();
+void SetMessageReturn(int value);
diff --git a/keyHandlers.cpp b/keyHandlers.cpp
index 336125f..4fd771d 100644
--- a/keyHandlers.cpp
+++ b/keyHandlers.cpp
@@ -18,7 +18,13 @@ void keyHandler(SDL_Scancode key) {
 		int num = key == 98 ? 0 : key - 88;
 		if (digit == -1) {
 			digit = num;
-			SendMessage("SetNumbers", num, -1);
+			SendMessage("CheckEnemyHit", 0, num);
+			if (GetMessageReturn() != 0) {
+				SendMessage("SetNumbers", -1, num);
+				digit = -1;
+			} else {
+				SendMessage("SetNumbers", num, -1);
+			}
 		}
 		else {
 			SendMessage("SetNumbers", -1, num);
diff --git a/mathwars.vcxproj b/mathwars.vcxproj
index 962b2b4..3385473 100644
--- a/mathwars.vcxproj
+++ b/mathwars.vcxproj
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Project DefaultTargets="Build" ToolsVersion="12.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
@@ -14,18 +14,19 @@
     <ProjectGuid>{5CCE4316-2638-47DA-9C0B-3075E1120FD1}</ProjectGuid>
     <Keyword>Win32Proj</Keyword>
     <RootNamespace>mathwars</RootNamespace>
+    <WindowsTargetPlatformVersion>10.0.17134.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>true</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
-    <PlatformToolset>v120</PlatformToolset>
+    <PlatformToolset>v141</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>
     <CharacterSet>Unicode</CharacterSet>
   </PropertyGroup>