1. Arctic battles. They can be specialized (conquest) battles like the Sea Battles are, but instead of large oil resources, the resources are either minerals or diamonds (or both). Some troop ideas are for GI Joe: Snow Cat (vehicle), Polar Bear (vehicle), Avalanche (vehicle), Iceberg (figure), Frostbite (figure), Snow Job (figure). For Cobra: Wolf (vehicle), Ice Sabre (vehicle), Ice-Viper (figure), Snow Serpent (figure). These vehicles and figures could only be used for Arctic battles.
2. For Sea Battles have submarines. GI Joe ideas are the S.H.A.R.C. and, for Cobra, the BUGG. Could also add divers for sea battles: Torpedo, Deep-Six, Wet-suit (Joes) and Eels (Cobra). Also could have the Cobra Battle Barge for Sea Battles. Use the Terror Drome base for Cobra instead of the Tactical Battle Platform. Could also have the Terror Drome as the Cobra base for special ops battles.
3. Para-Vipers for Cobra. They can be the counterpart to the Joes Paratroopers. Introduce Frag-Vipers for Cobra as a counterpart to Gung-Ho. Lowlight as long distance shooter, similar to the Baroness
4. Introduce the GI Joe APC or Warthog AIFV. Either vehicle could have the capability to deploy Steel Battalion Troops during the battle. Another Joe vehicle idea is the Bridge Layer: it could lay its bridge over minefields and/or barricades to allow Joe vehicles and troops to bypass these types of defences. Somewhat similar, but Tripwire could be a new Joe soldier that deactivates mines during a battle.
5. An Anti-aircraft gun as a defensive unit. Best part is that the gun could also be employed against ground targets, unlike the Anti-air missiles. Cobra has the ASP and the Joes have the FLAK or the Whirlwind
6. VTOL jets that operate like the helicopters in the game in that they can hover. Cobra has the Rattler and the Joes have the Sky Hawk or the Tiger Rat (the captured Rattler used by GI Joe’s Tiger Force).
7. Comms specialists: Joes could have Breaker or Dial-Tone and Cobra the Tele-Vipers. These specialists could call in air strikes or artillery.
8. Similar, but computer specialist: Mainframe for the Joes and Techno-Viper for Cobra. Both could hack enemy defences.
9. Toxic warfare specialists: Air Tight for the Joes and Toxo-Vipers for Cobra. Their gas could cause major damage to troops that deploy from barracks. Gas could either have no effect, or very limited effect on vehicles.
10. Motorized action packs from the 1987 / 1988 series (series VI & VII) that can be equipped by soldiers and give bonus boost to the unit using it.