I'm working on a puzzle game, where users must solve many different
puzzles. Once they complete a puzzle, they will be able to try the next
puzzle. Each puzzle is stored as a row in the puzzle in a database
table. The problem is, how would I select the puzzles the next highest
puzzle and lower? I could use a query something like "select * from
puzzles where id <= $completedid + 1", but it would break is there were
any holes in the ID. Also, it would use the ID as something more than a
unique identifier for each row, which is a bad thing. Any suggestions
for a better way?
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