Laser interactions with mass-limited targets are studied here via 2D3V relativistic electromagnetic particle-in-cell (PIC) simulations. We also describe our newly developed code that uses novel efficient algorithms. Damping regions have been implemented in order to eliminate spurious reflection of outgoing electromagnetic waves from boundaries of the simulation box. Mass-limited targets limit undesirable spread of absorbed laser energy out of the interaction zone. Mass-limited target, such as droplets, are shown to enhance the achievable fast ion energy significantly.