There's a few games that I remember spiking pretty hard:
Dead or Alive 4 Kasumi Clone - Have fun with a teleporting enemy who can two shot you.
Terraria after Wall of Flesh - A whole new woooooooooooooooorld
Zelda: A Link to the Past - It's easy now, but I remember as a kid how hard Dark World seemed when i finally got ot it. Hell the first boss of Dark World wrecked me.
Last boss of Paper Mario and Paper Mario Thousand Year Door - Both start introducing some pretty cheap mechanics, and both require you to be on your A game to beat.
Dead or Alive 4 Kasumi Clone - Have fun with a teleporting enemy who can two shot you.
Terraria after Wall of Flesh - A whole new woooooooooooooooorld
Zelda: A Link to the Past - It's easy now, but I remember as a kid how hard Dark World seemed when i finally got ot it. Hell the first boss of Dark World wrecked me.
Last boss of Paper Mario and Paper Mario Thousand Year Door - Both start introducing some pretty cheap mechanics, and both require you to be on your A game to beat.