creatures game sourced
Creatures
An artificial-life game in which the player hatches and raises Norns whose neural-network brains, simulated biochemistry, and haploid digital genomes produce learned behavior and heritable mutation.
parts
12 mechanics, as Creatures does themcore · 4
Creature care
The player's hand pointer feeds Norns, shows them objects, and tickles or slaps them; neglect leads to hunger, disease, and death, but care shapes behavior only indirectly through learning.
Creature learning
A neural-network brain maps sensed objects and drives to actions; drive reduction reinforces the action that preceded it, and the hand's tickle and slap act as reward and punishment through the same pathway.
Needs decay
Drives such as hunger and tiredness are concentrations in a simulated biochemistry that rise over time and fall when actions such as eating or resting succeed.
Trait inheritance
Haploid digital genomes with no dominant or recessive genes encode brain wiring, biochemistry, and organs; offspring genomes mutate, and every boxed copy shipped a unique starting set of egg genomes.
supporting · 8
Agent inspection
Contagion
Grendels steal food, injure Norns, and carry diseases that sicken the population.
Content sharing
Exported Norns and genomes were swapped and bred across players by a large online community.
Lifecycle and aging
Norns hatch, grow, breed, and die within roughly 40 hours of play.
Modding API
Natural-language interaction
Players teach nouns by naming objects a Norn is looking at and verbs with a learning computer, then type instructions that the Norn may choose to obey.
Pause and speed control
Permadeath
core loop
hatch eggs -> Norns act on biochemical drives -> player rewards, punishes, and teaches words -> neural weights shift toward drive-reducing actions -> Norns breed and pass mutated genomes -> next generation behaves differently
design notes
Steve Grand built each Norn as a stack of coupled models rather than a scripted pet: a neural network whose sight neurons are grouped one per object type, a biochemistry of chemicals and organs that sets drive levels, and a haploid genome with no dominance that codes for both. Learning is behaviorist: high drive levels act as punishment and reductions as reward, so the player's tickles and slaps only matter through the same chemistry. Because the genome builds the brain and body, mutations produce Norns that cannot see, lack organs, or never die, which the online breeding community catalogued and traded. Norns live about 40 hours, short enough for many generations.
appears in
the paper, 3 sections · 6 chapters · 2 episodesbacklinks
computed from other recordsclaims
1 with sourcesNorn genetics are haploid, with no dominant or recessive genes and no recombination between loci, and mutation can disable organs or produce Norns that cannot see or hear.