A tiled-based metal-only reflectarray (RA) using stainless steel unit cells (UCs) is proposed in this letter. The RA aims at providing a low-cost high-gain antenna solution with the agility for customers living in harsh environments such as in the wilderness or under military threatening. The metal-only UCs, each fabricated separately using the laser cutting process with a prescribed reflection phase, are treated as mosaic tiles on a panel supported with a low-loss 3-D printing frame. The reflection phase, and hence the main beam direction, of the RA can be re-constructible according to the arrangement of the UCs. For the proof of concept, an RA with a diameter of 16 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> , consisting of 820 UCs, is demonstrated at X-band. The UC comprises four spiral slots whose lengths control the reflection phase. The focal-to-diameter radio is 0.625. By re-arranging the UCs on the panel similar to a jigsaw puzzle, four application scenarios are experimentally verified. The first case has the main beam point to the broadside direction (0°). The other two have an oblique beam of 30° or 45° from the zenith; the final case consists of two main beams pointing to broadside (0°) and 30° from the zenith simultaneously. In the broadside case, a peak gain of 29.1 dBi and an aperture efficiency of 35.7% are achieved at 10 GHz, while the 3-dB gain bandwidth is 10.1%. A comparison table is summarized to manifest the uniqueness of the proposed idea.