Hello! Glad you came to A Side, the puzzles will get progressivly harder. But here in the A side the puzzles tend to involve more Patterns and Logical Puzzles then the B side. Although that doesn't mean the B side doesn't contain any Patterns or Puzzles, it just means A side contains more. It also doesn't mean A side is only Patterns and Puzzles, it just means it will contain more than B side.
This puzzle is probably the hardest puzzle in the whole website of IRNaM.