Reference Request: Companion to Munkres' Analysis

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I am currently self studying multivariable calculus from Munkres' Analysis on Manifolds. However, I find most of the exercises in Munkres easy, and although they help me internalize the topics covered in the preceding section, I would really like a source for a number of harder problems. I have already browsed through several similar queries on this site, but I have not been able to find any answers that suit my needs. I would appreciate some advice on where I can find such problems.