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    <p>First of all you need to share the same b2World in both the classes and then you can access the Sprites.mm world.</p> <p>For more understanding I've created a demo which would work. I am adding the code of the Sprites.mm code which I called as Spritese.h &amp; Spritese.mm</p> <p>The below is the Spritese.h code </p> <pre><code> @interface Spritese : CCLayer { NSMutableArray *arrSprite; b2World* world; } @property (nonatomic,retain) NSMutableArray *arrSprite; -(id)initWithArrayOfSprites : (b2World *)_world; @end </code></pre> <p>The Below one for the .mm</p> <pre><code> @implementation Spritese @synthesize arrSprite; #define PTM_RATIO 32 #define kTagBatchNode 1 -(id)initWithArrayOfSprites :(b2World *)_world{ if((self = [super init])){ CGSize screenSize = [CCDirector sharedDirector].winSize; world = _world; //Set up sprite CCSpriteBatchNode *batch = [CCSpriteBatchNode batchNodeWithFile:@"blocks.png" capacity:150]; [self addChild:batch z:0 tag:kTagBatchNode]; for(int i=0; i&lt;3; i++)//creating 3 objects [self addNewSpriteWithCoords:ccp(screenSize.width/2, screenSize.height/2)]; } return self; } -(void) addNewSpriteWithCoords:(CGPoint)p { CCLOG(@"Add sprite %0.2f x %02.f",p.x,p.y); CCSpriteBatchNode *batch = (CCSpriteBatchNode*) [self getChildByTag:kTagBatchNode]; //We have a 64x64 sprite sheet with 4 different 32x32 images. The following code is //just randomly picking one of the images int idx = (CCRANDOM_0_1() &gt; .5 ? 0:1); int idy = (CCRANDOM_0_1() &gt; .5 ? 0:1); CCSprite *sprite = [CCSprite spriteWithBatchNode:batch rect:CGRectMake(32 * idx,32 * idy,32,32)]; [batch addChild:sprite]; sprite.position = ccp( p.x, p.y); // Define the dynamic body. //Set up a 1m squared box in the physics world b2BodyDef bodyDef; bodyDef.type = b2_dynamicBody; bodyDef.position.Set(p.x/PTM_RATIO, p.y/PTM_RATIO); bodyDef.userData = sprite; b2Body *body = world-&gt;CreateBody(&amp;bodyDef); // Define another box shape for our dynamic body. b2PolygonShape dynamicBox; dynamicBox.SetAsBox(.5f, .5f);//These are mid points for our 1m box // Define the dynamic body fixture. b2FixtureDef fixtureDef; fixtureDef.shape = &amp;dynamicBox; fixtureDef.density = 1.0f; fixtureDef.friction = 0.3f; body-&gt;CreateFixture(&amp;fixtureDef); [arrSprite addObject:sprite]; } @end </code></pre> <p>In the HelloWorld.h file import the Class Spritese and add</p> <pre><code>@property(nonatomic,retain) Spritese *sprit; </code></pre> <p>and synthesize it in .mm file</p> <p>Now in the init method of the HelloWorld add this code</p> <pre><code>sprit = [[Spritese alloc] initWithArrayOfSprites:world]; [self addChild:sprit]; </code></pre> <p>And finally in the tick OR update method you need to add </p> <pre><code>-(void) tick: (ccTime) dt { int32 velocityIterations = 8; int32 positionIterations = 1; world-&gt;Step(dt, velocityIterations, positionIterations); for (b2Body* b = world-&gt;GetBodyList(); b; b = b-&gt;GetNext()) { if (b-&gt;GetUserData() != NULL) { CCSprite *myActor = (CCSprite*)b-&gt;GetUserData(); myActor.position = CGPointMake( b-&gt;GetPosition().x * PTM_RATIO, b-&gt;GetPosition().y * PTM_RATIO); myActor.rotation = -1 * CC_RADIANS_TO_DEGREES(b-&gt;GetAngle()); Spritese *s = (Spritese *)b-&gt;GetUserData(); for(int i=0; i &lt; [sprit.arrSprite count]; i++){ if(s == [sprit.arrSprite objectAtIndex:i]){ s.position = CGPointMake( b-&gt;GetPosition().x * PTM_RATIO, b-&gt;GetPosition().y * PTM_RATIO); s.rotation = -1 * CC_RADIANS_TO_DEGREES(b-&gt;GetAngle()); NSLog(@"Process Sprite Here"); } } } } } </code></pre> <p>I hope the code example would work at your side.</p>
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    1. COIt guess it worked, but I am having an issue which I guess is from the update method. For now I want to impose gravity (higher than the world) on the sprites in say `arrSprite` but they're still responding to the world gravity. See the update method below. `-(void)update:(ccTime)dt { int32 velocityIterations = 8; int32 positionIterations = 1; world->Step(dt, velocityIterations, positionIterations); for (PhysicsSprite* spr in sprit.arrSprite) { b2Body* bBody = [spr getPhysicsBody]; bBody->ApplyForce(b2Vec2(0,20*bBody->GetMass()), bBody->GetWorldCenter()); } }`
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    2. COsorry abt the code formatting
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    3. COAs you share the same world in both the layer. You would not be able to differentiate both the worlds. I guess any layer cannot have more than 1 world.
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