A turbine rotor blade for a turbine section of an engine, the turbine section including a shroud surrounding the turbine rotor blade, comprising: a platform; and an airfoil extending from the platform into a mainstream gas path of the turbine section, the airfoil comprising a pressure side wall; a suction side wall joined to the pressure side wall at a leading edge and a trailing edge; a tip cap (330, 592) extending between the suction side wall and the pressure side wall; a pressure side squealer tip extension (332, 594) inclined in a forward direction and extending from the pressure side wall at a first angle relative to the pressure side wall, the pressure side squealer tip extension (332, 594) comprising a first cooling hole (400, 500) that converges from an inlet (480, 580) to an outlet (482, 582), wherein the pressure side squealer tip extension (332,594) includes a forward wall having a forward surface that is coplanar with a forward surface of the pressure side wall, wherein the pressure side squealer tip extension (332, 594) terminates at a radial wall (424, 526), and wherein the outlet (482, 582) of the first cooling hole (400, 500) is at least partially formed on the radial wall (424, 526); a suction side squealer tip extension (334, 596) inclined in a forward direction and extending from the suction side wall at a second angle relative to the suction side wall, wherein a junction between the suction side squealer tip extension and the suction side wall is curved; and an internal cooling circuit configured to deliver cooling air (402, 502) to a gap between the pressure side squealer tip extension (332, 594) and the shroud via the first cooling hole (400, 500). a platform; and an airfoil extending from the platform into a mainstream gas path of the turbine section, the airfoil comprising a pressure side wall; a suction side wall joined to the pressure side wall at a leading edge and a trailing edge; a tip cap (330, 592) extending between the suction side wall and the pressure side wall; a pressure side squealer tip extension (332, 594) inclined in a forward direction and extending from the pressure side wall at a first angle relative to the pressure side wall, the pressure side squealer tip extension (332, 594) comprising a first cooling hole (400, 500) that converges from an inlet (480, 580) to an outlet (482, 582), wherein the pressure side squealer tip extension (332,594) includes a forward wall having a forward surface that is coplanar with a forward surface of the pressure side wall, wherein the pressure side squealer tip extension (332, 594) terminates at a radial wall (424, 526), and wherein the outlet (482, 582) of the first cooling hole (400, 500) is at least partially formed on the radial wall (424, 526); a pressure side wall; a suction side wall joined to the pressure side wall at a leading edge and a trailing edge; a tip cap (330, 592) extending between the suction side wall and the pressure side wall; a pressure side squealer tip extension (332, 594) inclined in a forward direction and extending from the pressure side wall at a first angle relative to the pressure side wall, the pressure side squealer tip extension (332, 594) comprising a first cooling hole (400, 500) that converges from an inlet (480, 580) to an outlet (482, 582), wherein the pressure side squealer tip extension (332,594) includes a forward wall having a forward surface that is coplanar with a forward surface of the pressure side wall, wherein the pressure side squealer tip extension (332, 594) terminates at a radial wall (424, 526), and wherein the outlet (482, 582) of the first cooling hole (400, 500) is at least partially formed on the radial wall (424, 526); a suction side squealer tip extension (334, 596) inclined in a forward direction and extending from the suction side wall at a second angle relative to the suction side wall, wherein a junction between the suction side squealer tip extension and the suction side wall is curved; and an internal cooling circuit configured to deliver cooling air (402, 502) to a gap between the pressure side squealer tip extension (332, 594) and the shroud via the first cooling hole (400, 500).