A multi-layer golf ball includes a core, an intermediate layer surrounding the core, and a cover layer surrounding the intermediate layer. The core defines an outer surface that includes a plurality of polygonal land portions substantially aligned on a common sphere, which has a diameter of between 22 mm and 32 mm. The intermediate layer has a radially inward-facing surface that is flush with the outer surface of the core, and has a radial thickness of between 4 mm and 9 mm. The outer surface of the core defines a first set of annular grooves disposed about a first axis, and a second set of annular grooves disposed about a second axis. Each of the first and second set of annular grooves extend radially inward from the common sphere, and the first axis and the second axis are orthogonal.

A golf ball includes an intermediate layer, a cover, and a paint film, wherein a base resin of the paint film is a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition containing a urethane polyol including a polyether diol with a number average molecular weight ranging from 800 to 3000 as a constituent component, and the golf ball satisfies the following requirements;
Mp200X75
Mp100
MmMc>100
Tm>Tc>Tp
(TmMm)/(TcMc)>7.5
(TcMc)/(TpMp)>2.4.
[Mp, Mm and Mc represent 10% modulus (kgf/cm.sup.2) of the paint film, intermediate layer and cover, respectively; Tp, Tm and Tc represent thicknesses (mm) of the paint film, intermediate layer and cover, respectively; and X represents a molar ratio (NCO/OH).]

A golf ball having contact time, CT.sub.143 of greater than or equal to about 400 microsecs, a Coefficient of Restitution, COR.sub.143 of greater than or equal to about 0.720, a TD5, TD6, or TD7 of from about 310 to about 320 yards when measured under each respective Test Condition, and a TD2 vs. Headspeed ratio of greater than about 2.3 when measured under Test Condition 2.

A golf ball includes a core, a mid layer, and a cover. A slope A1 of a straight line connecting a central point of the core and a point at 2.5 mm from the central point and a slope A2 of a straight line connecting the point at 2.5 mm and a point at 5.0 mm from the central point are each 1.00 or more. A slope A5 of a straight line connecting a point at 10.0 mm from the central point and a point at 12.5 mm from the central point and a slope A6 of a straight line connecting the point at 12.5 mm and a point at 15.0 mm from the central point are each 1.50 or more. The cover is formed of a resin composition containing an ionomer resin, with the ionomer resin present in an amount of 60% by mass or more.