Rainbow squads drop the planning map in Tom Clancy's Rainbow Six: Lockdown, Red Storm's 2005 entry that plays as a more linear shooter than the earlier games. Pre-mission diagrams matter less, and the cube is one of the console ports of that tighter campaign.
Rooms are cleared in sequence, with fewer pauses to assign a whole team on a blueprint. The Rainbow name remains, but the fantasy has shifted toward the doorway in front of you.
Players who learned the series on a planning screen meet a different pace here. The cube port is that linear Rainbow, not the Raven Shield mission editor.