Sumul rules and strategy

You draw cards one at a time, trying to get as close to 21 as possible. Go over 21 and the whole hand scores zero, so the entire game comes down to deciding whether to draw one more card or stop here. Only points move, with nothing to wager, nothing to lose, and no one to face down.

The counting-to-21 mechanic itself comes from old card games and belongs to no one. What this app adds is two things: a structure of five stages to clear in order, and the fact that today's whole deck is shown on screen.

Normally a game like this leaves the next card unknown, so you end up trusting luck. Here, the screen shows exactly how many of each rank remain. So what separates skill from guessing isn't nerve, it's arithmetic. Read the table and you can state the risk of the next card as a precise fraction, if not to the decimal.

Card values

The deck has 52 cards across 13 ranks, four of each. 2 through 10 count at face value, and J, Q, and K all count as 10, so 10-value cards total 16 across those four ranks. Suits aren't counted and don't appear on screen.

Ace is the only exception. It counts as 1 or 11, whichever helps: it becomes 11 if that doesn't push you past 21, and automatically drops to 1 if it would. It's always resolved in your favor, so there's nothing to choose.

How one hand plays out

Hit draws the top card of the deck. Keep hitting as long as you like, then stand when you want to stop. The moment you stand, that hand's total becomes your score and the hand ends. You can't stand with zero cards, so every hand starts with a hit.

Busting and an exact 21

If your total goes over 21 after a draw, that hand ends immediately and scores zero. There's no chance to stand. The hand is gone, and the cards you drew leave the deck along with it.

Hit exactly 21, though, and that hand's score doubles to 42. Remember that number, since it comes up again later.

From here on, this is what this particular app actually does. It varies between apps in the same family, so a quick read now saves confusion later.

Five stages, four hands each

There are five stages, each giving you four hands. The target starts at 30 points for stage one and rises by 8 each stage after: 30, 38, 46, 54, 62 in order. That totals 230 points, which you have to build out of a single 52-card deck.

The moment a stage's score reaches its target, you advance immediately. Your stage score resets to zero and your hands refill to four. Any points past the target don't carry over to the next stage, but they do stay in your total score. Leftover hands don't carry over either. Use all four hands without reaching the target and the run ends on the spot.

So clearing a stage early saves cards, not hands. Hands refill regardless, but the deck is one shared budget across all five stages.

Today's deck and the remaining-card table

The deck's order is shuffled using a value drawn from that day's date. Everyone who plays that day gets the same order, and a new deck opens when the day changes. Shuffling and drawing both happen entirely in the browser, so there's no record going back and forth to a server and no account needed.

The table below the board shows all 13 ranks and how many of each haven't come up yet. A rank that's fully gone fades to zero, and the total remaining count is shown above the table too. The card in your current hand is already counted as gone, so you can trust the numbers on the table as they stand.

The table only tells you how many are left, though, not the order they'll appear in. So what you can actually calculate isn't what the next card will be, but how risky it is. And that probability comes out exactly right as long as you have the table.

If you hit after the deck is empty, no card comes and your current total is locked in as-is. The run doesn't cut off abruptly, but neither does any way to build the score you'd need to clear the remaining stages.

Saved progress and missing features

Once you draw your first card, progress is saved to this browser and survives a refresh or closing the tab. A run with zero draws isn't saved. If the saved date doesn't match today, it's discarded in favor of a new run, and malformed saved data is discarded the same way.

Missing features are listed plainly too: there are no relics or upgrade cards that alter a run, no undo, and no button to restart today's round. Today's deck only happens once, so every card you draw sticks to the result.

Competing

When a run ends, you can copy today's result. The copied text carries the date, the stage you reached, your total score, and how many times you busted. It doesn't include the deck order or which cards you drew, so sending it to someone still mid-run leaks nothing.

Paste a friend's result into the compete box and it settles the match. Total score is compared first; if it's tied, fewer busts wins. If bust counts are tied too, it's a draw. A different date means no comparison at all, and you're told it's a different day's deck.

Everyone gets the same deck order on the same day, so a gap in total score isn't about who got lucky. It's about who stopped and pushed better against the same cards. You only need to trade a line of text, so there's no account to make and no need to be online at the same time.

Draw freely up to 11

At 11 or under, no card can bust you, since the highest any single card is worth is 10, and an Ace that would overflow drops to 1 automatically. There's zero risk in this range, so standing here just throws away a hand for nothing.

Risk is division, not a feeling

At 12, only a 10-value card can bust you. 10, J, Q, and K together start at 16 cards out of 52, roughly 3 in 10. As high cards thin out, this range only gets safer.

At 16, anything 6 or higher busts you. That's eight ranks, 6 through 10, J, Q, K, which is 32 cards fresh out of the deck, about 6 in 10. But if those eight ranks have already thinned out, the picture changes. With 20 cards left and only 8 of them at 6-or-higher, your bust chance drops to 4 in 10. Add up the risky cards and divide by the total remaining, and that's the number. This one division is the core of the whole game.

A hand counting an Ace as 11

A hand where the Ace is counting as 11 can never bust on the next card. The moment it would overflow, the 11 drops back to 1 and takes ten points with it. Holding an Ace and a 5, for instance, sits at 16; even a 10 won't bust it, it just settles back to 16. Drawing one more card in a hand like this is nearly free, so it's worth reaching for 21.

The weight of 42

An exact 21 scores 42. Stage one's target of 30 and stage two's target of 38 both clear in a single hand like that, just two or three cards, which saves the deck too. From stage three on, one hand isn't enough by itself, but 42 is still worth a pair of ordinary hands.

So when your total sits around 14 to 16, it's worth counting how many of the exact rank you need are left. At 16, you need a 5; if all four 5s remain out of 40 cards left, that's 1 in 10. Weigh that against the bust chance in the same spot, since deciding from only one side makes you either always too timid or always too reckless.

Thinking in card budget

Five stages at four hands each means up to 20 hands drawn from 52 cards. Spend even two cards per hand and that's 40, not much slack. Spend cards carelessly in the early stages and the later ones find little left on the table.

Standing on a low total gets costlier the further you go. Four hands at 12 points each is 48, short of stage five's 62 target. The final stage needs an average of over 15 points per hand to clear. Clearing early stages quickly and safely, then getting bold in the later ones, fits this curve.

Factor busts into the math too

A bust scores zero, but it costs the deck a high card in return. As the remaining deck shrinks, each slot on the table carries more weight, which actually sharpens your later math. Bust count only matters in a tie on total score in a match, so there's no need to fear busting itself wherever it could raise your total.

There's one spot where a bust is genuinely costly, though: the last hand of a stage when you still haven't hit the target. Bust there and your score is zero, ending the run on the spot. In that one spot, and only that one, run your odds one notch more conservative.

When the first card is high

Starting on a 10 leaves you 11 points of room. That's still a zero-risk range for one more card, so take it. Once you're at two cards and around 16, that's where judgment starts, and the basis for it is the table, not a feeling.

Hesitating right below the target

If your stage score is a few points short with hands still left, there's no need to push. Standing on even a low total still clears the target and refills your hands to four. On your last hand with a big gap left, though, standing safely just ends the run, so pushing all the way to 21 is the only path.

When you stop checking the table

Once a hand feels familiar, it's tempting to skip the table and draw on instinct, which is exactly where this game leaks the most score. Especially late in a run, the remaining deck looks very different from the fresh one, and old instincts go wrong. Scan the risky ranks before every draw and your total score changes noticeably.

When yesterday's approach doesn't work

The deck reshuffles every day. An order that worked yesterday has no reason to work today. What stays the same day to day is how to read the table. What's worth memorizing is the counting method, not the order.

A big score gap with a friend

Same day means the same deck, so any gap comes down to where each of you stopped. It's usually one of two spots: standing too early in a zero-risk range, or drawing one card too many on the final hand. Trade results and talk through where each of you stopped. It shows up immediately in the next round.