The most important aspect of gaming is the ability of the directional pad and input buttons to register user interactions with an acceptable level of responsiveness. It was here that the K1 GBA SP suffered, with the recognition of input received only through increasing levels of force. While each directional input was tolerable, the “B” button simply would not respond unless pushed down until it completely stopped. Often it gave the feeling of wrong doing, as if pushing so hard would eventually break the system. The flawed choice of input buttons seems to be limited to certain builds of the K1 GBA SP. Early prototype reports described the directional pad and buttons as being very responsive, while Product ID 00610601 and 00610603 reports have equally described a similar experience. While some users will most undoubtedly alter their game playing techniques to not only accommodate the input experience, they will eventually grow accustomed to it. However, there remains the possibility that other units may be produced with an unresponsive button. To put it all into perspective the entire experience would need to be described with a few examples: I was unable to drive and shoot at the same time while playing Spy Hunter. Similarly, it is next to impossible to run and jump while playing any of the classic Super Mario Bros. games. While playing Double Dragon and River City Ransom EX, it was impossible to execute back-to-back attacks as the ability to push the “B” button hard enough began to hurt my thumb. User reports have confirmed the requirements of the buttons, while none have confirmed problems with which I experienced. Leading me to believe that perhaps the "B" button flaw is limited only to the review unit.
