PATTERNARCADE

INSERT COIN · MASTER THE PATTERNS

Every algorithm pattern is a level. Every LeetCode problem is a boss fight. Watch it, predict it, code it — then see where it runs inside real AI systems. No memorizing solutions: you unlock the knowledge graph node by node, and the bosses fall on their own.

▼ CHOOSE YOUR LEVEL ▼
🪙 0⭐ 0 / 102🎯 0 / 34 NODES CLEAR
🕳 WORLD 1 · HASH CAVERNS⛰ WORLD 2 · HEAP MOUNTAIN🏖 WORLD 3 · STRING SHORES🌊 WORLD 4 · SORTING STRAITS🔗 WORLD 5 · POINTER LAGOON⚓ WORLD 6 · STACK & QUEUE DOCKS🗻 WORLD 7 · TREE & GRAPH PEAKS🧭 WORLD 8 · GRID TERRITORIES🔒The Lookup Problem🔒The Hash Spell🔒Frequency Counter🔒BOSS: Two Sum🔒Tree in an Array🔒The Heap Property🔒Bubble Up🔒Priority Queue🔒The Top-K Pattern🔒BOSS: Top K Frequent🔒BOSS: Data-Stream Median🔒Two Pointers🔒Sliding Window🔒The Stretchy Window🔒BOSS: Longest Unique Substring🔒Binary Search🔒The Merge Step🔒The Partition🔒BOSS: Merge Intervals🔒Pointer Rewiring🔒Tortoise & Hare🔒BOSS: LRU Cache🔒The Stack🔒The Queue🔒Tree DFS🔒Binary Search Tree🔒BFS Shortest Path🔒Topological Sort🔒BOSS: Word Ladder🔒BOSS: Serialize a Tree🔒The Grid Graph🔒Flood Fill🔒Multi-Source BFS🔒BOSS: Surrounded Regions
ready to play cleared locked (finish prerequisites)👾 = boss (a real LeetCode problem)