Arguably the best TACTICAL GBT game.
The game is about conquering a map. You can move your units in any order you prefer. You can undo any move unless a moving unit affect any other unit (damage/buff/healing/recon), after which it is locked. Numerical effects are twisted with a random factor, for the better or the worst.
Basically you are brought from a battle map to the next until the conclusion of the scenarios. You can start with the Humans scenario, or with the Orcs scenario. Upon completing both, you will be brought to the final scenario (elves).
Units are carried over from a map to the next, and even from a scenario to the next scenarios. Units are completely restored between two maps unless it was destroyed. They keep any magical item found and any experience gains. Units have 5 levels they can earn. They have stats which varies from 5-19 as level 0 units, each level give them a gain of 1 in each stat, and the choice of an ability, so an experienced units may be about twice stronger then a starting unit and some abilities can be critical (hero's killer to fight troll for example).
Heroes can earn up to 10 levels and cannot be destroyed, only disabled for a scenario (which may be a condition for defeat). Heroes also can carry 3 magical items.
PROS: Solid game-play. Interesting story. Achieving and progression feeling. Graphics/animations are outstanding for the genre.
CONS: Not hard enough for vets. Random damage turn your attention away from the true focus. Easy to forget an unit which didn't move or attack.