  We introduce the domain wall color code, a new variant of the quantum
error-correcting color code that exhibits exceptionally high code-capacity
error thresholds for qubits subject to biased noise. In the infinite bias
regime, a two-dimensional color code decouples into a series of repetition
codes, resulting in an error-correcting threshold of 50%. Interestingly, at
finite bias, our color code demonstrates thresholds identical to those of the
noise-tailored XZZX surface code for all single-qubit Pauli noise channels. The
design principle of the code is that it introduces domain walls which permute
the code's excitations upon domain crossing. For practical implementation, we
supplement the domain wall code with a scalable restriction decoder based on a
matching algorithm. The proposed code is identified as a comparably
resource-efficient quantum error-correcting code highly suitable for realistic
noise.
