Use the spikes, which are not in the water, to jump from platform to platform as a way to cross the Colosseum. Requires knowing the position of every spike in the room, and hitting the spikes while morphed can help. The first jump is particularly tough. A SpringBallJump from the sand with HiJump, or Grapple can be used to get past it.

Requires:

{
  "notable": "Spike Platforming with Move Assist (Left to Right)"
}
"canWalljump"
"Morph"
"canCarefulJump"
"canIframeSpikeJump"
{
  "or": [
    "Grapple",
    {
      "and": [
        "canSuitlessMaridia",
        "canPlayInSand",
        "HiJump",
        "canNeutralDamageBoost",
        "canTrickySpringBallJump",
        {
          "spikeHits": 2
        }
      ]
    }
  ]
}
{
  "spikeHits": 1
}
{
  "or": [
    {
      "spikeHits": 1
    },
    "canHorizontalDamageBoost"
  ]
}