ThreeInvisibleDucks wrote:I can't think of a game with *endless* replayability
Well, literally endless one is not required but let me provide a simple example from Age of wonders 3:
1) There is Warlords class with great units, one of them is berserker.
2) There are 9 races.
Tirgan Berserker is unique, it has a Punce ability, which allows to jump 3 tiles once per fight, the attack hits target once without retaliation and puts Tigran Berserker in defense mode.
Frostling Berserker is unique, it partially loses some physical attack but gets some frost attack. This fixes main problem of berserkers - lack of elemental attack.
Draconian Berserker gets Improved Wall Climbing. This makes the berserker really rgeat for attacking cities.
Orcish Berserker gets War Cry, the ability greatly increases attack once per fight.
Dwarven Berserker gets Projectile Resistance making it extremely tough vs enemy archers etc.
Basically all those racial units result in different tactics despite you use Berserker all the time (or you can ignore Berserker completely if you want)
Now add other class units, racial units (Elves have nice archers which can be protected by those berserkers), heroes (I use mods where every hero can select one of 3 professions and one of 3 "mods" which open completely different and unique traits for each hero on every level), ability to have units from different races be part of one stack, ability to upgrade cities to have extra either good or evil units (provided by another mod), random maps etc., specializations (adept air, master creation, expander to name a few) and you get almost endless replayability.
TL/DR: Crawl almost lacks synergy and it makes 20 species and 30 gods result in 50 combos instead of potential 600.