user: ### NOW ANSWER:
Question: What is the highest Version, when Release Date is "2011-04-01"?
Columns: ['Title', 'Developer', 'Genre', 'Release date', 'Version']
Types: ['text', 'text', 'text', 'text', 'real']
Sample row: ['3D Picture Puzzle', 'Microsoft Studios', 'Puzzle', '2011-03-23', 1.0]
SQL:

assistant: SELECT MAX("Version") FROM "Table" WHERE "Release date" = '2011-04-01';