THE YOROLL MECHANIC LIBRARY

Take great play apart. Build something new.

One entry, one mechanic: its core loop, the trade-offs, real examples and a prototype you can start today. Built for solo devs and small teams.

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280
mechanics
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categories
214
reference games

All mechanics280 mechanics

Farming & growth

Planting and Crop Care

Seeds sown today only become a harvest through care every day after.

Prototype complexity
Who plays
Solo decisions
  1. 01Till and sow
  2. 02Water and tend daily
  3. 03Watch growth stages
  4. 04Harvest when ripe
Stardew Valley · Core Keeper
Fishing & catching

The Bite Window

A bite lasts a moment; strike too early or late and you come up empty.

Prototype complexity
Who plays
Solo decisions
  1. 01Cast and wait
  2. 02Watch the float
  3. 03Strike on the bite
  4. 04Move to the reel-in
Stardew Valley · Dinkum
Cooking & food

Learning Recipes

You hold the ingredients but lack know-how; each recipe gives old items a new use.

Prototype complexity
Who plays
Solo decisions
  1. 01Obtain a recipe somewhere
  2. 02Check needed ingredients
  3. 03Gather and cook
  4. 04Use the dish's effects
Stardew Valley · The Long Dark
Gathering & mining

Tool Tier Gates

The ore is right there, but without a harder pick you can't break it.

Prototype complexity
Who plays
Solo decisions
  1. 01Find a new resource
  2. 02Learn your tool is too weak
  3. 03Gather to upgrade
  4. 04Return and harvest
Terraria · Valheim
Survival & needs

Juggling Survival Needs

Hunger, thirst, cold and fatigue all drain at once; you can only fix one at a time.

Prototype complexity
Who plays
Solo decisions
  1. 01Read every need meter
  2. 02Pick the most urgent one
  3. 03Spend time and supplies on it
  4. 04Others slide meanwhile
The Long Dark · Don't Starve
Breeding & ecology

Neighbor Crossbreeding

Plant different strains side by side and they influence each other's offspring.

Prototype complexity
Who plays
Solo decisions
  1. 01Collect different strains
  2. 02Plan the neighbor layout
  3. 03Wait for crossbreeding
  4. 04Select the best offspring
Rust · APICO
Crafting & automation

Conveyor Routing

Moving items from A to B is easy; keeping every line from tangling is the game.

Prototype complexity
Who plays
Solo decisions
  1. 01Plan source and destination
  2. 02Lay belts around obstacles
  3. 03Watch flow and jams
  4. 04Reroute or add layers
Factorio · Satisfactory
Building & space

Load-Bearing Builds

To build taller and wider, first answer one question: will it hold?

Prototype complexity
Who plays
Solo decisions
  1. 01Place a piece
  2. 02Read the support signal
  3. 03Add pillars or better material
  4. 04Expand or collapse
Valheim · RimWorld
Business & tradeNew

Hold It on the Shelf

Lock an item you want and buy it next round, safe from the refresh.

Prototype complexity
Who plays
Solo decisions
  1. 01Spot a wanted item
  2. 02Short on cash, lock it
  3. 03Play the next round
  4. 04Return and buy
Backpack Battles · Super Auto Pets
Income & idle growthNew

Save for Interest

Spend less now, earn more next round—until an opponent breaks you.

Prototype complexity
Who plays
Competitive play
  1. 01Collect round income
  2. 02Decide how much to spend
  3. 03Earn interest on savings
  4. 04Absorb the fight result
Teamfight Tactics · Dota Underlords
Inventory & resources

Shape-Based Packing

Items no longer take one slot; their shape is the cost and your bag becomes a puzzle.

Prototype complexity
Who plays
Solo decisions
  1. 01Pick up a new item
  2. 02Rotate to find space
  3. 03Rearrange or discard
  4. 04Move on with the trade-off
Backpack Hero · Save Room - Organization Puzzle
Puzzles & deduction

Push Without Getting Stuck

Boxes push but never pull; one wrong shove can wedge them for good.

Prototype complexity
Who plays
Solo decisions
  1. 01Study boxes and targets
  2. 02Plan push order
  3. 03Push and watch for dead ends
  4. 04Undo or solve
Patrick’s Parabox · Baba Is You
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