Wario Secret Message Game

Wario Secret Message Game, also referred to as Can you decode a secret back-to-school message? by its card and description, is a post in the News section released on Play Nintendo's website. The challenge of the post is to solve a cryptogram.

Questions
The solution is marked with a green border.

Letters
Each letter is represented by an item, block, or enemy.
 * A - Buzzy Beetle (unused)
 * B - Koopa Troopa (unused)
 * C - Hammer Bro (unused)
 * D - Piranha Plant
 * E - Red Shell (unused)
 * F - Green Shell
 * G - Warp Pipe
 * H - Note Block (unused)
 * I - Empty Block
 * J - POW Block (unused)
 * K - Brick Block (unused)
 * L - Goomba
 * M - ? Block (unused)
 * N - Yoshi's Egg
 * O - Propeller Mushroom
 * P - 1-Up Mushroom (unused)
 * Q - Super Star (unused)
 * R - Fire Flower
 * S - Super Mushroom (unused)
 * T - Coin (unused)
 * U - Bob-omb (unused)
 * V - Lakitu (unused)
 * W - Monty Mole
 * X - Boo (unused)
 * Y - Thwomp (unused)
 * Z - Cheep Cheep (unused)

Description
''Wario was sent to the principal’s office—again! Can you guess why? You can try to decode the secret message below to get the answer!''