After providing a brief overview of Marcus Willaschek's Kant on the Sources of Metaphysics, I critically reconstruct his account of ‘transcendental realism’ and the role that it plays in the dramatic narrative of the Critique of Pure Reason. I then lay out in detail how Willaschek generates and evaluates various versions of transcendental realism and raise some concerns about each. Next, I look at precisely how Willaschek's Kant thinks we can avoid applying the ‘supreme’ dialectical principle (for every conditioned there is a totality of conditions which is unconditioned) to the domain of appearances. Finally, I call into question Willaschek's efforts to appropriate the lessons of the Transcendental Dialectic without following Kant into transcendental idealism.