Beyond the 3rd endless mode

Due to the game.xml problem, there are no more endless loops past the 30,000 distance mark, so there aren't any real endless modes past the third. After the third endless mode is passed, the Repeating Room Glitch starts, so the game can continue until it breaks, or you go over 100,000 distance, or you run out of balls.

4th loop (36000-44000)

 * A player called "coburnanimates YT" commented on the video SMASH HIT NEW HIGH SCORE-17,998, by Trip 222,"40,564.... I was playing for around 2 hours straight.... That's when you know you need help..."
 * MondaysAreTheWorst got a high score of 40543 on January 26, 2020 (in the pacific state time) , before it was that high score , he posted a comment on 5th endless mode (at that point he commented he was a anonymous user), "anyone realized that i scored a EXACT 36 THOUSAND?" saying the score was exactly 36000 points (previously).

5th loop (44000-52000)

 * A Youtuber named Sandeep Sharma posted a comment on SMASH HIT NEW HIGH SCORE-17,998 that said, "My Score is 45900".
 * It may well be one of the former world records of the game. (comment here)
 * NOTE: There is no other proof, as far as I can tell. Not even a video on the channel.
 * Nahin Sarker replied: I got 47089 comment here, he also commented onSmash Hit Glitch In A Glitch - The Room of Purgatory (34170 points) .......and that comment said My Score is 47089
 * Another Youtuber named MWFAE924TGWL / Microsoft Windows XP commented on the video Smash Hit Glitch In A Glitch - The Room of Purgatory (34170 Points) which said "Well, Mine is 47228! HA! TRY TO BEAT THAT!" (comment here) (Although that was a reply to a certain youtuber that commented on that video). It may well be another former world record for the game.
 * NOTE: There's a video of him failing at checkpoint 4 with 5 balls (posted only a month after he made the comment), and there is no evidence to prove this is a real score. In the video "Alex plays Smash Hit," he is only at 0, and gets to checkpoint 4 with best distance of 4263.

6th loop (52000-60000)

 * https://www.youtube.com/watch?v=a_M-imNHHkg

7th loop (60000-68000)

 * MMAADDEEIIRRAA :v said: 67347 score days in trying to do this (comment here) on the video SMASH HIT NEW HIGH SCORE-17,998.
 * This is the former world record of Smash Hit.
 * Henzo Uriel replied: Try to beat 62225 that's my score and I'm not kidding (comment here) on the video Smash Hit Glitch in a Glitch - The Room of Purgatory (34170 points)
 * This score might have been another former world record of the game, up until MMAADDEEIIRRAA :v beat Henzo Uriel with 67347 (which then was beaten).

8th loop (68000-76000)
No records here.

9th loop (76000-84000)

 * Marina owo beaten the record of 67347 at one point, it was a reply for that comment Henzo Uriel posted on that video  that video. It says: Well guy gained a 78k >> :D.
 * This has to be a world record of Smash Hit.

124th loop (960000-1040000) (Not recommended)

 * The maximum distance that can fit in the statistics button is 999999 (only 6 digits available), meaning that hackers, to get more than a million (1000000) most likely hacked the best distance to something what the heck or unfair or normally impossible.

Playing non-stop

 * This would take a whopping 118560 seconds (1976 minutes a.k.a almost 33 hours or 1 day and 9 hours) to reach if the game were played non-stop, so it is most likely impossible unless you were to stay up all night and through the next day as well.
 * Playing non-stop would fail because the battery would run out, even in an all-day phone unless you charged it all the time.
 * You would likely get a very high electricity bill, and the ballcount would have to be hacked unless you spend an extremely long time ball grinding.)
 * A tech mod might help. See Smashing Tech Wiki.

On-off playing (Random Rooms Glitch)

 * An alternative method would be to waste the day time in the Random Rooms Glitch, then power the phone off all night, resetting the choice of rooms, and setting back distance to the beginning of the last room you were in.
 * You would still need a lot of ball grinding.

Disclaimer

 * (If it's not clear: Don't try this (both ways) at home.)
 * Since 999999 is the max distance, that is the maximum distance meaning that this is the maximum possible world record of Smash Hit.

Disclaimer
Not all of this information has been verified to be true; in fact, it is probably not.