Lacking sheet. Remember the Ice Beam combines with the other beam weapons in Zero Mission.
Long Beam - Item not vital, so you can safely skip it.
Charge Beam - Item not vital, so you can safely skip it.
Ice Beam - Vital. Item needed to complete Zero Mission.
Wave Beam - Item not vital, so you can safely skip it.
Plasma Beam - Vital. You cannot skip picking the Unknown Items up and one of them becomes the Plasma Beam at the later part of the game.
You should rip all the beams and combinations instead of just the Ice Beam and it's combos only.
Long Beam - Item not vital, so you can safely skip it.
Charge Beam - Item not vital, so you can safely skip it.
Ice Beam - Vital. Item needed to complete Zero Mission.
Wave Beam - Item not vital, so you can safely skip it.
Plasma Beam - Vital. You cannot skip picking the Unknown Items up and one of them becomes the Plasma Beam at the later part of the game.
You should rip all the beams and combinations instead of just the Ice Beam and it's combos only.