Lazy to read all
but here what SPOOL stated:
" "Snowballing"
If in any draw, neither the Jackpot Prize nor the Group 2, 3 or 4 prizes is won, the allocation for the Jackpot Prize and the Group 2, 3 and 4 prizes shall be carried forward or "snowballed" as follows:-
If the Jackpot Prize is not won in any draw, the Jackpot Prize amount (i.e. thirty-eight per cent (38%) of the Prize Pool plus the "snowballed" amount(s)) of that draw shall be added to the Jackpot Prize allocation of the next draw. The "snowballing" shall continue until the Jackpot Prize is won or at the end of four (4) (or more, as the case may be) consecutive draws, whichever is earlier.
If the Group 2 prize is not won in any draw, the Group 2 pool amount (i.e. eight per cent (8%) of the Prize Pool plus the "snowballed" amount(s)) of that draw shall be added to the Group 2 prize allocation of the next draw. The "snowballing" shall continue until the Group 2 prize is won.
If the Group 3 prize is not won in any draw, the Group 3 pool amount (i.e. five and a half per cent (5.5%) of the Prize Pool plus the "snowballed" amount(s)) of that draw shall be added to the Group 3 prize allocation of the next draw. The "snowballing" shall continue until the Group 3 prize is won.
If the Group 4 prize is not won in any draw, the Group 4 pool amount (i.e.three per cent (3%) of the Prize Pool plus the "snowballed" amount(s)) of that draw shall be added to the Group 4 prize allocation of the next draw. The "snowballing" shall continue until the Group 4 prize is won.
There shall be no "snowballing" of the Minimum Guaranteed Amount for the Jackpot Prize.
"Cascading"
The "cascading" process shall apply to unwon Jackpot Prize as follows:-
If the Jackpot Prize is not won at the end of four (4) consecutive draws, then the Jackpot Prize pool amount of the fourth (4th) draw (i.e. thirty-eight per cent (38%) of the Prize Pool of the fourth (4th) draw plus amounts "snowballed" from the three (3) preceding draws) shall be paid in the following manner:-
If the Jackpot Prize is not won - to be shared equally among the Group 2 winning shares of the said fourth (4th) draw.
If neither the Jackpot Prize nor the Group 2 prize is won - to be shared equally among the Group 3 winning shares of the said fourth (4th) draw.
If neither the Jackpot Prize nor the Group 2 or 3 prizes are won - to be shared equally among the Group 4 winning shares of the said fourth (4th) draw.
If neither the Jackpot Prize nor the Group 2, 3 or 4 prizes are won - to be shared equally among the Group 5 winning shares of the said fourth (4th) draw.
If neither the Jackpot Prize nor the Group 2, 3, 4 or 5 prizes are won - to be shared equally among the Group 6 winning shares of the said fourth (4th) draw.
If neither the Jackpot Prize nor the Group 2, 3, 4, 5 or 6 prizes are won - to be shared equally among the Group 7 winning shares of the said fourth (4th) draw.
If neither of the Jackpot Prize nor the Group 2, 3, 4, 5, 6 or 7 prizes are won - to be added to the Jackpot Prize allocation of the next draw, when the "cascading" process set out in this Rule 7.6 (including this paragraph (g)) shall apply, and in which event, the expression "fourth (4th) draw" hereinabove shall be read to mean the draw in question and the expression "amounts "snowballed" from the three (3) preceding draws" hereinabove shall be read to mean amounts "snowballed" from all the draws preceding the draw in question.
Under each of the above circumstances, winners for Group 2, 3, 4, 5, 6 and 7 prizes shall also receive their respective prizes set out in Rule 7.2. "
https://www.singaporepools.com.sg/en/rul...neral.html