Solving 70-80% of puzzles shows you are a good (very good?) small scale problem solver. A quick pursue of your code would probably also demonstrate sufficient proficiency in your language of choice.

As a hiring manager, residual concerns that I would try to get a handle of in interview would be:

* How do you deal with solving problems in larger systems, particularly in code you did not design, write, or perhaps even knew existed up to the point of discovering a problem

* Typical team work and communication problems.