List of features added in VCMI

Some of game features have already been extended in comparison to Shadow of Death:

Support for 32-bit graphics with alpha channel. Supported formats are .def, .bmp, .png and .tga
Support for maps of any size, including rectangular shapes
No limit of number of map objects, such as dwellings and stat boosters
Hero experience capacity currently at 2^64, which equals 199 levels with typical progression
Heroes can have primary stats up to 2^16
Unlimited backpack
Support for Stack Experience

The list of implemented cheat codes and console commands is here.

List of bugs fixed in VCMI

These bugs were present in original Shadow of Death game, however the team decided to fix them to bring back desired behaviour:

Some of H3 mechanics can't be straight considered as bug, but default VCMI behaviour is different:

Pathfinding. Hero can't grab artifact while flying when all tiles around it are guarded without triggering attack from guard.
Battles. Hero that won battle, but only have temporary summoned creatures alive going to appear in tavern like if he retreated.
Battles. Spells from artifacts like AOTD are autocasted on beginning of the battle, not beginning of turn.
Spells. Dimension Door spell doesn't allow to teleport to unexplored tiles.

[LCtrl] + LClick – perform a normal click (same as no hero is selected). This make it possible to select other hero instead of changing path of current hero.

[LShift] + LClick – splits a half units from the selected stack into an empty slot.
[LCtrl] + LClick – splits a single unit from the selected stack into an empty slot.
[LCtrl] + [LShift] + LClick – split single units from the selected stack into all empty hero/garrison slots
[Alt] + LClick – merge all splitted single units into one stack
[Alt] + [LCtrl] + LClick - move all units of selected stack to the city's garrison or to the met hero
[Alt] + [LShift] + LClick - dismiss selected stack`

It's now possible to open Tavern (click on town icon), Townhall, Quick Recruitment and Marketplace (click on gold) from various places:

Mouse click on castle icon in the town screen open quick recruitment window, where we can purhase in fast way units.

Additional color are supported for text fields (e.g. map description). Uses HTML color syntax (e.g. #abcdef) / HTML predefined colors (e.g. green).

This is white

This is white

{This is yellow}

This is yellow

{#ff0000|This is red}

This is red

{green|This is green}

This is green

https://heroes.thelazy.net/index.php/Main_Page Wiki that aims to be a complete reference to Heroes of Might and Magic III.