Psychological / reinforcement
Designs that exploit reinforcement schedules and cognitive biases — variable-ratio rewards, near-miss, sunk-cost/entrapment, illusion of control, sensory reinforcement.
Patterns in this family (8)
Variable-ratio reward / near-miss
Slot-machine-like reinforcement and 'almost won' framing drive repeated attempts.
Aesthetic / sensory manipulation
Celebratory audio-visual feedback reinforces spending and reward moments.
Collection & completionism pressure
A visible, incomplete collection — roster, index, grid — compels players to keep playing or paying to complete the set.
Endowed progress
Giving players an artificial head-start or visible partial progress so the urge to complete it pulls them onward.
FOMO / limited-time offers
Artificial scarcity and urgency pressure players into purchases before a countdown expires.
Illusion of control / skill framing
Chance outcomes are presented as if skill or choice could influence them.
Optimism & frequency bias
Framing that inflates perceived chances of winning — emphasising wins and near-misses, downplaying losses — to exploit optimism and frequency illusions.
Sunk-cost / entrapment
Designs make prior investment justify further spending or time.