Triangle Crossword

123456
Across
  1. 2. when you don't want anyone to know what you are doing
  2. 3. the sound a snake makes
  3. 5. something you do on April Fool's Day
  4. 6. to stop the light from shining
Down
  1. 1. like triangles or diamonds
  2. 4. when you cannot go to a different area