Table and/or Query Help

Hello, I am adding a section to my site to track high scores for different levels in a game. I am looking for the optimal table structure and optimal query to gather high scores for each level. I am planning to have two tables: one to keep track of meta data for each level and one for the actual scores.

boards table
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boardID INT(11) PRIMARY KEY
large_image VARCHAR(20)
small_image VARCHAR(20)
number_scores INT(11)

scores table
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entry INT(11) AUTONUMBER / PRMIARY KEY
boardID INT(11) UNIQUE
accountID INT(11) UNIQUE
name VARCHAR(20)
initials CHAR(3)
score FLOAT

To pull a list of all scores ranked in order, I plan to use the following query:
SELECT boards.boardID, scores.name, scores.initials, scores.score FROM boards LEFT JOIN scores USING (boardID) ORDER BY boards.boardID, scores.score, scores.entry;

The above query does work, but I am afraid what the performance will be like when each level (about 50) has several hundred entries.

Is there a way I can run a single query and limit the number of results returned for each board? Or is it more efficient to run a query for each level and use the LIMIT clause?

Thank you for your help