Some people play a game with their dog(s). They put the dog in a "stay", hide, then call the dog to find them. This is a mentally stimulating as well as physical activity for the dog.
And just what does it mean that God hiding things is to "His glory?" That's pretty mysterious, isn't it? Perhaps the Lord wants us to get emotional and spiritual exercise by pondering His ways. Sometimes we get insight. Sometimes we remain baffled. It's an exercise of faith - accepting that we will not understand everything about God. Not yet. There is still mystery. But will we trust God, when we don't understand? Would life be interesting if we did know everything there is to know?
Sometimes it is not fun to seek a God who seems to be hiding things from us. When we persevere through the mystery, though, we can find, eventually, a great treasure.
When are you tempted to give up and reject God? What makes you want to keep holding on?