Before you get too deep into the game, you should understand how the Hero system works in Toy Soldiers: War Chest.
Basically the battlefields in the game remain the same regardless of the Hero you choose to use. That said though, the units do NOT.
Each Hero has its own set of units, which means in addition to needing to replay each and every battlefield in order to obtain the different challenges and etc for each Hero, you ALSO have to upgrade, unlock, advance, and basically level each of the different weapons.
That means getting used to the different weapons and turrets that each Hero brings to the game. That is actually a pretty complicated aspect, since even among the turret types they will have different approaches.
A good example of this is the Anti-Armor for The Kaiser and Phantom. For The Kaiser the Anti-Armor weapon is a plunging fire turret, which means that it fires into the air on a sloping path and then drops onto the target. The Anti-Armor for Phantom is a direct fire beam weapon - which means you have to have line-of-sight to use it!
That is a very significant difference, and it WILL impact how you use it!
That being the case, basically each Hero brings a different game to the game - and that means that a strategy you used on one level, with one Hero, may not work with another.
For these reasons we recommend that you work your way through the game one Hero at a go - so start with The Kaiser and finish up with him BEFORE you switch to another Hero. That way you get the full taste and experience of the game with that Hero, and then begin again with a different Hero for an all new game play experience!
Mixing them at the same time though, well, that can make things very confusing! Which is why this guide is written in a linear fashion, using the recommended approach.
What that means is that each level is written at its core for The Kaiser. Then when we have completed all play as THAT Hero, we come back around and add any updates, changes, or different strategies for the next Hero, and so on, etc. until we complete the process.
Fair enough?