diff --git a/game/game.js b/game/game.js
index c50d18f47..f32bfd68c 100644
--- a/game/game.js
+++ b/game/game.js
@@ -33,32 +33,43 @@
 	// gnc: GeNCoroutine
 	const gnc={
 		async:fn=>function genCoroutine(){
-			return gnc.await(fn.apply(this,arguments))
+			let result=fn.apply(this,arguments);
+			result.name="genCoroutine";
+			result.status="next";
+			result.state=undefined;
+			return gnc.await(result);
 		},
 		await:gen=>new Promise((resolve,reject)=>{
-			const _next=value=>gnc.next(gen,resolve,reject,"next",value,_next,_throw);
-			const _throw=err=>gnc.next(gen,resolve,reject,"throw",err,_next,_throw);
-			_next(undefined);
+			let result=gen;
+			let nexts=resolve;
+			let throws=reject;
+			if(gnc.is.coroutine(gen)) {
+				try{
+					result=gen[result.status](result.state);
+				}catch(error){
+					reject(error);
+					return;
+				}
+				if(!result.done){
+					nexts=(item)=>{
+						gen.state=item;
+						gen.status="next";
+						gnc.await(gen).then(resolve,reject);
+					}
+					throws=(err)=>{
+						gen.state=err;
+						gen.status="throw";
+						gnc.await(gen).then(resolve,reject);
+					}
+				}
+				result=result.value;
+			}
+			Promise.resolve(result).then(nexts,throws);
 		}),
 		is:{
-			coroutine:item=>typeof item=="function"&&item.name=="genCoroutine",
+			coroutine:item=>(typeof item=="function"||gnc.is.generator(item))&&item.name=="genCoroutine",
 			generatorFunc:item=>item instanceof GeneratorFunction,
-			generator:item=>item.constructor==GeneratorFunction
-		},
-		next:(gen,resolve,reject,key,arg,_next,_throw)=>{
-			let info,value;
-			try{
-				info=gen[key](arg);
-				value=info.value;
-			}catch(error){
-				reject(error);
-				return;
-			}
-			if(info.done){
-				resolve(value);
-			}else{
-				Promise.resolve(value).then(_next,_throw);
-			}
+			generator:item=>item.constructor.constructor==GeneratorFunction
 		}
 	};
 	const _status={