NAND² is a single-player strategy and simulation game focused on digital logic and computer architecture. Players begin with a single NAND gate and progressively construct increasingly complex circuits, culminating in a functional 16-bit CPU complete with advanced features such as pipelines, branch prediction, and cache memory. The experience blends puzzle-solving with hands-on education, allowing users to wire components, test designs, and then program the resulting hardware to run simple games and applications.
Gameplay
The core loop centers on circuit construction and verification. Each completed component enters a personal palette for reuse in subsequent challenges, encouraging modular thinking and incremental refinement. Simulation occurs gate by gate in real time, supporting live observation of processor behavior without abstraction layers or hidden elements. A built-in code editor supports assembly programming with HEX viewing and immediate feedback on errors, while truth tables and cycle-by-cycle diagnostics pinpoint issues in circuit performance.
Progression follows a structured path through hardware fundamentals. Early stages emphasize basic logic operations and binary representation using relays. Later stages introduce transistors for memory elements, clocks, arithmetic logic units, and random-access memory, including construction of a Turing machine. Integrated circuits enable the first custom processor designs along with input-output handling. Advanced microprocessor levels cover custom instruction sets, stack implementation, algorithmic solutions, and a RISC-V-style core. Speed optimization phases add pipeline stages, branch prediction logic, and cache systems, while system-level challenges address booting sequences and multitasking. In one era, players integrate a keyboard and pixel display to execute a first-person shooter directly on their self-built CPU.
Reference cards detail every part, and all complex modules derive exclusively from previously constructed elements. This approach eliminates black-box components and reinforces understanding through repeated application. A sandbox mode permits free experimentation outside the main sequence.
Game Modes
The primary structure divides content into six eras with a total of 201 levels. The Relays era contains 26 levels centered on logic gates, selection circuits, and binary numbers. The Transistors era expands to 33 levels covering memory systems, clock signals, the arithmetic logic unit, RAM, and a Turing machine. Integrated circuits follow with 21 levels introducing the initial processor, basic programs, and I/O ports. The Microprocessors era offers 85 levels focused on custom instructions, stacks, algorithms, robot control, and a RISC-V-style architecture. Speed optimization includes 31 levels dedicated to pipelines, branch prediction, cache design, and creation of a personal game. The final System era comprises 5 levels addressing booting procedures and multitasking.
Embedded within the I/O framework are several self-contained games that run on the constructed hardware. These include guiding a robot through a maze, playing Guess the Number, and competing in Nim. The level editor allows creation of custom sequences complete with reference solutions, automated tests, briefs, and hints, which can be shared through the integrated workshop system. Achievements track completion milestones, and cloud saves preserve progress across sessions.
Is It Worth Playing?
NAND² targets individuals with an interest in computer science fundamentals, logic design, or hands-on hardware simulation. Its gate-level fidelity and requirement to build every subsystem from prior components provide a transparent view of how processors emerge from basic elements. The inclusion of programming challenges and playable applications on the final hardware adds practical context to the theoretical work.
Those who enjoy methodical puzzle progression and iterative optimization will find sustained engagement across the extensive level count. The editor and sharing tools extend replay value for creators interested in designing their own challenges. Because the game remains in development with a planned release in March 2027, prospective players can evaluate its educational focus through available previews and descriptions before committing.
Overall, the title suits learners seeking a direct, unmediated exploration of digital systems rather than abstract tutorials or pre-built tools. Its emphasis on verification and reuse aligns well with users who value precision and incremental mastery in simulation environments.
