Just a small nitpick. @synthesize goes away in "modern" Objective C. Removing them will give new iOS developers one less thing to be annoyed about. Since you've done a great job, I think a lot of people will start with this project. Thanks!

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@synthesize position = _position;

@synthesize lightManager = _lightManager;

@synthesize row = _row;

@synthesize column = _column;

@synthesize isPartOfRoute = _isPartOfRoute;

@synthesize topConnector = _topConnector;

@synthesize rightConnector = _rightConnector;

@synthesize lightState = _lightState;

@synthesize lightValue = _lightValue;

@synthesize gameLayer = _gameLayer;

@synthesize innerCircleSprite = _innerCircleSprite;

@synthesize outerCircleSprite = _outerCircleSprite;

@synthesize routedSprite = _routedSprite;

@synthesize valueSprite = _valueSprite;

@synthesize activeTimeRemaining = _activeTimeRemaining;

@synthesize cooldownTimeRemaining = _cooldownTimeRemaining;

@synthesize chargeTimeRemaining = _chargeTimeRemaining;