Those “cross thingies” are usually the lock-on / target effect from a fast move, not a special objective or hidden item. In Roblox Rocket Arena-style games, the name players use can vary, but the visual is typically just a targeting or attack indicator.

What it means

  • It often shows that a weapon or move is aiming, charging, or locking onto a player.
  • In classic Rocket Arena, the core gameplay was built around rockets, platforms, and bridges, so extra icons like that are usually part of the combat feedback rather than the map itself.

Most likely answer

If you saw a floating cross/crosshair-shaped thing near a player, it’s probably:

  1. A target marker.
  2. A lock-on animation/effect.
  3. A visual from a specific weapon, ability, or game mode.

Tiny example

If someone is using a move that tracks enemies, the game may show a cross-like marker over or near the target so you know the attack is active.

TL;DR: the “cross thingies” are most likely a lock-on/targeting effect , not a collectible or map object.