Upgrades are bought with coins dropped from enemies, which come in [[File:JOPKCoin1.png|link=]] and [[File:JOPKCoin5.png|link=]] denominations, the [[File:JOPKCoin5.png|link=]] coins being very rare. | Upgrades are bought with coins dropped from enemies, which come in [[File:JOPKCoin1.png|link=]] and [[File:JOPKCoin5.png|link=]] denominations, the [[File:JOPKCoin5.png|link=]] coins being very rare. |