The following keywords form the entire vocabulary of the language. The keywords must be written in UPPER case. Therefore PRINT is a valid command, while print is not.

 16BIT AAHS ABS ACCORDION ACOUSTIC ADD ADDRESS AGE AGOGO 
 ALT ALTO AND APPLAUSE ARRAY ARROW AS ASC ASTERISK 
 AT ATARI ATARIXL ATMOSPHERE BACK BACKGROUND BAG BANJO BANK 
 BANKED BAR BARITONE BASS BASSOON BEG BEGIN BELL BELLS 
 BELONG BIN BINARY BIRD BIT BITMAP BLACK BLIT BLOWN 
 BLUE BOOM BORDER BOTTLE BOWED BOX BRASS BREATH BRIGHT 
 BRIGHTNESS BROWN BUFFER BYTE CALL CALLIOPE CAN CAPS CAPSLOCK 
 CASE CDOWN CELESTA CELLO CENTER CENTRE CHAR CHARANG CHIFF 
 CHOIR CHR CHURCH CIRCLE CLARINET CLAVI CLEAN CLEAR CLEFT 
 CLINE CLIP CLS CMOVE COCO CODE COLECO COLLISION COLON 
 COLOR COLORMAP COLORS COLOUR COLOURMAP COLOURS COLUMN COLUMNS COMMA 
 COMMODORE COMPLETE COMPRESS COMPRESSED CONST CONTRABASS CONTROL COPY COUNT 
 CPC CRIGHT CRSR CRYSTAL CSPRITE CUP CURSOR CYAN CYCLES 
 CYMBAL DARK DATA DEBUG DEFAULT DEFINE DELETE DESTINATION DIM 
 DISABLE DISTANCE DISTORTION DIV DLOAD DO DONE DOUBLE DOWN 
 DRAGON DRAW DRAWBAR DRUM DRUMS DTILE DTILES DULCIMER DWORD 
 ECHOES ECM ELECTRIC ELLIPSE ELSE ELSEIF EMBEDDED EMPTY EMPTYTILE 
 ENABLE END ENDIF ENDSELECT ENDSTORAGE ENGLISH ENSEMBLE EQUAL EVERY 
 EXACT EXIT EXPAND EXPLICIT EXPLOSION FALSE FI FIDDLE FIFTHS 
 FILEX FILL FINGER FIRE FIRST FLIP FLOAT FLUTE FONT 
 FOR FRAME FRAMES FREE FRENCH FRET FRETLESS FROM FUNCTION 
 FX GAMELOOP GET GLOBAL GLOCKENSPIEL GOBLINS GOLD GOSUB GOTO 
 GR GRAND GRAPHIC GRAY GREEN GREY GUITAR GUNSHOT HALO 
 HALT HALTED HARMONICA HARMONICS HARP HARPSICHORD HAS HEIGHT HELICOPTER 
 HEX HIDDEN HIDE HIT HOME HONKY HORIZONTAL HORN HSCROLL 
 IF IGNORE IMAGE IMAGES IN INK INKEY INPUT INSERT 
 INSTR INSTRUMENT INT INTEGER INVERSE IS JAZZ JDOWN JFIRE 
 JLEFT JOY JOYCOUNT JRIGHT JUP KALIMBA KEY KEYSHIFT KEYSTATE 
 KILL KOTO LAVENDER LBOUND LEAD LEFT LEN LET LETTER 
 LIGHT LINE LOAD LOCATE LOCK LONG LOOP LOWER MAGENTA 
 MARIMBA MASKED MAX MCM MELODIC MEMORIZE MEMORY METALLIC MID 
 MILLISECOND MILLISECONDS MIN MINUS MMOVE MOB MOD MODE MONOCOLOR 
 MONOCOLOUR MOVE MSX MUL MULTICOLOR MULTICOLOUR MUSIC MUTED NEW 
 NEXT NOISE NONE NOP NORMAL NOT NOTE NYLON OBOE 
 OCARINA OF OFF OLIVE ON ONLY OOHS OPTION OP_DEC 
 OP_INC OR ORANGE ORCHESTRA ORCHESTRAL ORGAN ORIGIN OUT OVERDRIVEN 
 OVERLAYED PAD PALETTE PAN PAPER PARALLEL PARAM PEACH PEEK 
 PEN PERCUSSIVE PERIOD PIANO PICCOLO PICK PINK PIPE PIZZICATO 
 PLAY PLOT PLUS POINT POKE POLYLINE POLYSYNTH POP POSITION 
 POSITIVE POUND POWERING PRECISION PRESERVE PRESSED PRINT PROC PROCEDURE 
 PURPLE PUT RAIN RANDOM RANDOMIZE RASTER RAW READ READONLY 
 RECORDER RED REED RELATIVE RELEASE REMEMBER RENDER REPEAT REPLACE 
 RESOLUTION RESPAWN RETURN REVERSE RGB RIGHT RING RND ROCK 
 ROLL ROW ROWS RUN RUNSTOP SAWTOOTH SAX SCAN SCANCODE 
 SCANSHIFT SCI SCREEN SCROLL SEASHORE SECTION SELECT SEMICOLON SEMIGRAPHIC 
 SEPARATOR SEQUENCE SET SGN SHADES SHAKUHACHI SHAMISEN SHANAI SHARED 
 SHIFT SHIFTS SHOOT SHOW SIGNED SITAR SIZE SLAP SLASH 
 SOPRANO SOUND SOUNDTRACK SOURCE SPACE SPAWN SPRITE SQR SQUARE 
 STANDARD STATE STEEL STEP STOP STORAGE STR STRING STRINGS 
 SWAP SWEEP SYNTH SYNTHBRASS SYNTHSTRINGS TAB TAIKO TAN TANGO 
 TASK TELEPHONE TEMPORARY TENOR TEXT TEXTADDRESS TEXTMAP THEN THREAD 
 THRESHOLD TI TICKS TILE TILEMAP TILES TILESET TIME TIMER 
 TIMPANI TINKLE TO TOM TONK TRANSPARENCY TRANSPARENT TREMOLO TROMBONE 
 TRUE TRUMPET TUBA TUBULAR TURQUOISE TWEET TYPE UBOUND UNIQUE 
 UNTIL UP UPPER USE USING VAL VALUE VAR VARIABLES 
 VARPTR VBL VERTICAL VIBRAPHONE VIDEO VIOLA VIOLET VIOLIN VISIBLE 
 VOICE VOLUME VSCROLL WAIT WARM WEND WHILE WHISTLE WHITE 
 WIDTH WITH WOODBLOCK WORD WRITE WRITING XCURS XGR XGRAPHIC 
 XOR XPEN XTEXT XY XYLOPHONE YCURS YELLOW YGR YGRAPHIC 
 YIELD YPEN YTEXT YX ZX 

In ugBASIC (like CBM BASIC) you do not need to isolate keywords from each other or from other identifiers with any separator, like spaces.

Identifiers are used to give a name to labels, variables, constants, procedures and functions. You may choose any name for identifier. Anyway, you have to follow some rules:

• the first character must be lowercase alphabetic;
• the remaining characters can be uppercase;
• the dollar symbol ($) identify string variables;
• identifier are case sensitive: pippo and pIPPO are different symbols
• they can be of any length, and all characters are significant.

Statements and commands can be separated using the colon symbol (:) character, and can end with LF or CR+LF characters. The separator is not required if there's only one statement in one line, as the following example:

 WHILE NOT finished : PRINT "continue" : WEND
 WHILE NOT finished
    PRINT "continue"
 WEND

If you begin a line with single quote (') character, or put it after colon symbol, it will be considered a comment until the end of the line. The same for the REM command, that is used to begin a comment.

 ' comment
 REM comment
 line = 1 :' comment
 line = 1 :REM comment

Whitespace (e.g. spaces and tabs) are ignored, since they are not needed. You are encouraged to use them if you need to make make the program more readable, or to remove it if you need to join competitions where number of lines is an important factor.

Labels can be used to identify any point of the source code. Labels are used by some statements, like GOTO and GOSUB statements. Labels must be appended with a colon character (:).

    GOSUB subroutine1
    END
 subroutine1:
    PRINT "subroutine1 has been called!"
    RETURN

As in traditional BASIC language, labels can be numeric, as well. Line numbers are treated like special labels by ugBASIC, but they must not followed by colon character (:).

The underscore (_) character at the end of the line can be used to split a single line to multiple lines, in order to be more readable.

 ' Write this very long line in a short one.
 DIM xx AS BYTE(32) = # { _
    x1, x2, x3, x1, x2, x3, x1, x2, x3, x1, x2, x3, x1, x2, x3, x1, _
    x2, x3, x1, x2, x3, x1, x2, x3, x1, x2, x3, x1, x2, x3, x1, x2, _
 }