A computer program product for creating an online object-selection contest is described. The computer program product includes a non-transitory computer-readable medium and computer program code stored on the non-transitory computer-readable medium. The code is configured to cause a set of one or more processors to perform the following steps. A load selectable data object specification interface is presented and selectable objects data specifying two or more selectable data objects is received. A required number specification interface is presented and required number data specifying a required number of the selectable data objects are received. At least one odds value is calculated. A reward specification interface is presented and reward data is received. Executable code is generated for accessing the online object-selection contest. Entry data is received. It is determined whether each entry in the set of entries is eligible for the one or more rewards.