Treacherous Halls

Treacherous Halls (Japanese: Charenji!! Togetoge Toride (チャレンジ！！トゲトゲとりで ''Challenge! Spiky Fortress, unofficially known as Spike Fortress or Coro Coro Castle)) is a promotional e-Reader level for Super Mario Advance 4''. Its official difficulty rating is ★★★★★. Much of the level consists of stomping enemies over spikes to cross them. Many Piranha Plants also appear, as well as two Flurries, one of which has to be ridden to collect an Advance Coin and also a 1-up. Boom Boom is fought at the end of the level. It is also one of the most difficult e-Reader levels in the game as shown in the card.

Enemies

 * Big Goombas
 * Big Koopa Troopa
 * Colossal Koopa Paratroopa
 * Goombas
 * Koopa Troopas
 * Buzzy Beetles
 * Red Paragoombas
 * Piranha Plants
 * Fire Piranha Plants
 * Flurries
 * Dry Bones
 * Koopa Paratroopas
 * Spiny
 * Boom Boom

New Level Elements

 * Flurry