+3 means he's in your lineups in 3 more leagues than your opponents' lineups: root for him. −3 is the reverse: root against him.
Tank leagues are flipped: your own players count against you, your opponents' players count for you. Mark a league as Tanking under Leagues in Settings, the gear at the top.
Games
"lean +4" beside a team adds up the nets of that team's players, counted in leagues: the team you want scoring.
Live and finished games show each player's line under his name, such as "14.2 pts · 5 rec · 72 yds · 1 TD". The points are Sleeper's standard PPR. "no ESPN stats" means ESPN has no box-score entry for him, so nothing is shown rather than a false 0.
"Proj" is the projected swing for the whole game: each player's projected PPR points times his net, added up. Upcoming games show it on the right, and live and finished games show it in small type under their swing.
Live games show the swing so far on the right of the card, and finished games show the final net points swing: each player's PPR points times his net, added up over all your leagues. "Helped +40 pts" means your players, on balance, scored 40 more points for you than against you. Under 5 points counts as even, and projections before kickoff are gray. Standard PPR, not each league's own scoring. Players Sleeper has no stats for count as 0, and the card says who.
Stat bars
Stat bars: the filled part is what he has so far and the tick is the line. A stub past the tick means he's over it. Bars only compare him to the line; swing and points tell you whether he helped. "DK" means a DraftKings line. "proj" means a Sleeper projection, used when no DraftKings line is posted. "game proj" is his projected fantasy points for the whole game. "anytime" is the touchdown line: 0.5, so one TD is over.
Matchups
The Matchups tab shows your score in every league this week, the closest first. While players are left, the pill shows where you should finish ("Proj win by 10.8") and the line under it shows where you stand now ("Now: down 3.2"). Live players count what they have plus their projection for the time left. "Toss-up" means the projected finish is within 5 points. Scoring is each league's own. The count at the top says how many are headed your way. In tank leagues, losing is the goal, so the pill also says "good" or "bad", e.g. "Proj loss by 6.9 · good".
Players
On the Players tab, # and $ switch between counting leagues and counting buy-in dollars (the Games tab has the same switch, "Leagues / Buy-in $", and the choice is shared), and the sliders button opens the ranking and filters. The strongest root-for and root-against players come first. Players who cancel out (0) sit in a collapsed "Even" group, and finished players in a collapsed group at the bottom.
"$" (count buy-in dollars) adds up the buy-ins of every league where a player is for or against you. "+$320" means he's for you in $320 more of buy-ins than against you. Set the buy-ins under Leagues in Settings; they stay on this device only.