Peggle

What it is. A pachinko-like arcade game: aim a launcher at the top of the screen, drop one ball, and watch it ricochet through a field of pegs, lighting them up. Clear the orange pegs to win the level. The input is a single angle; the payoff is a cascade.

Player fantasy / why it’s fun. I barely did anything and something wonderful happened. The pull is maximal juice on minimal input: you set one angle, and the game rewards you with an escalating fireworks show — lucky bounces, a “free ball” bucket, and a final slow-mo, orchestral, rainbow-explosion victory that’s wildly out of proportion to the click that caused it.

Design DNA

Take a trustworthy physics sandbox and lay a variable-ratio reward schedule over it, then celebrate every outcome — especially the lucky ones — with disproportionate feedback. The skill floor is near zero (aim and drop), but the feel is ecstatic because the physics manufactures surprise and the juice amplifies it. The genius is the gap between input effort and output spectacle: a single trivial action detonates a chain of delightful consequences you didn’t fully control but feel credit for.

The design does two clever things at once. First, it outsources complexity to physics — the player supplies one number (the angle), and the peg field plus deterministic bounces generate all the richness, so the game is deep without the input being hard. Second, it launders luck into feeling like skill: because you chose the shot, a lucky twelve-peg cascade reads as your triumph, not the RNG’s gift. The variable-ratio schedule supplies the surprise; the aim supplies the ownership; together they make a near-zero-skill action feel earned.

The hidden design work is honest physics — swept collision so the ball never tunnels, energy conservation so bounces feel real — because the whole payoff depends on trusting the scatter. A ball that clips through a peg or gains speed from a bounce breaks the illusion instantly; the ecstasy is only possible on a foundation the player never doubts.

Load-bearing structures

Structure	Why it works
One trivial input, cascading output	Aim + drop is all the player does; physics + pegs generate the complexity. The effort/reward gap IS the fun.
Trustworthy swept-collision physics	Closed-form time-of-impact = no tunneling ever; energy honesty (a bounce never speeds the ball up) makes the scatter feel real, not glitchy. FUN.md truth. `genre-physics-arcade`.
Variable-ratio surprise	Lucky multi-peg bounces and the free-ball bucket are unpredictable payoffs — the schedule that keeps you dropping “one more ball.” `system-reward-schedules`.
Disproportionate celebration	Slow-mo, zoom, orchestral sting, screen-filling explosion on the last orange peg — feedback far exceeds the input. `pattern-juice-choreography`.
Read the board, place the bet	Skill lives in choosing the shot — angling for clusters, banking off walls — turning luck into a decision. `pattern-risk-reward`.
Aim-search proves winnability	Pure state → clone-and-fire candidate aims → count clears: winnability AND a difficulty meter for free. FUN.md law 7.
Escalating per-ball scoring	Points ramp within a single drop (peg after peg), so even one ball has an arc. `pattern-feedback-loops`.

What to steal

Widen the gap between input effort and output spectacle. One trivial action → a cascade of consequence. This is the whole feel; steal it into any arcade toy.
Overlay a variable-ratio schedule on physics. Let lucky bounces and bonus buckets manufacture surprise; the unpredictability is the compulsion. See system-reward-schedules.
Celebrate disproportionately. Slow-mo + zoom + audio sting on the win moment. Feedback should exceed the action — that’s the Peggle signature. pattern-juice-choreography / design/JUICE.md.
Make honest physics the foundation. Swept collision (no tunneling), energy conservation — the surprise only delights if the ball is trusted. Wire via genre-physics-arcade.
Use aim-search bots to prove every level is clearable within the ball budget and to rate its difficulty (FUN.md law 7). Pure state means you clone the board, fire candidate aims, and count clears — winnability proof and a difficulty meter from the same loop.
Give the trivial input a decision. Skill lives in choosing the shot — banking off a wall, aiming for a cluster, going for the free-ball bucket. Layer a real read over the simple action so mastery has somewhere to grow. pattern-risk-reward.

What’s just theme (drop it)

The unicorns / Peggle Masters fiction. Cosmetic; the loop is theme-free.
The rainbow “Ode to Joy” victory. The disproportionate celebration is structural; the specific song/rainbow is a pattern-juice-choreography instance you’d re-skin.
The specific power-ups. Bomb/multiball/etc. are reward-schedule variants; the categories matter, the names don’t — system-reward-schedules.
Peg colours (orange = must-clear). A subset of targets defines the win is structural; the colour is readability flavour — pattern-readability.

Composes into

genre-physics-arcade — its canonical anchor; trustworthy-flight physics lives there.
system-reward-schedules — variable-ratio payoff exemplar.
pattern-juice-choreography — disproportionate-celebration reference.
pattern-risk-reward — reading the board to place a shot.
pattern-feedback-loops — escalating per-ball scoring.

Twist seams

Peggle but the pegs are a deck you place before the drop (mechanic-swap) — you build the board, then fire; aim becomes construction. Pulls in genre-deckbuilder / anchor-loop-hero planning.
Peggle but two players share one board and alternate drops (perspective) — every bounce sets up or spoils the rival’s next shot. Feeds system-coop-and-competition.
Peggle but one ball for the whole level (constraint) — no retries per level; the trivial input becomes a high-stakes single bet, converting variable-ratio joy into push-your-luck tension. Sharpens pattern-risk-reward.
Peggle but the pegs fight back (mechanic-swap) — pegs move, shield, or shoot on a telegraph between your drops; the calm arcade toy gains a reactive-threat layer. Pulls in system-telegraphs and shifts the read from static to dynamic.