EXCALIBUR E108 Einstein Brain Station - Manual (Page 15)

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6.1.2 S
PECIAL FEATURES
(a) Retract and replay: You can take back
a series of entries by repeatedly pressing
the BACK key. You can then enter
different numbers, or else replay the same
series by repeatedly pressing FORWARD.
(b) Locked numbers: If you are fairly sure
that a number you have entered is correct,
you can “lock” it by bringing the cursor
to it and pressing ENTER. The locked
number is underlined. While locked, a
number cannot be erased (with CLEAR)
or overwritten. You can, however,
“unlock” the number in the cursor square
by pressing ENTER again.
(c) Display of legal numbers: If you try
to enter a number that “clashes” with the
same number in the same row, column
or box, the computer rejects this entry as
“illegal”. If you press the LEGAL key, the
bottom line of the display will show the
numbers that can “legally” be placed in
whichever square contains the cursor.
For example at the start of the puzzle in §
6.1.1, with the cursor in the middle square
of the extreme right column, the bottom
line would show:
To switch this feature off, re-press
LEGAL.
(d) Notepad: Suppose you have logically
eliminated 6 numbers as possibilities for
a particular square. You can make a note
of the other 3 numbers as “candidates”
for this square, by using the “note pad”
feature:
(1) Press NOTE. The bottom line
shows the candidates (if any) that
you have recorded for the current
cursor square.
(2) To add or remove a candidate, press
the corresponding number key.
(3) You may move the cursor to
another square, to view or alter its
candidates.
(4) When ready, re-press NOTE
(clearing the bottom line), and
continue solving.
6.2 K
AKURO
There are numerous horizontal and
vertical sequences of blank squares.
The idea is to fi ll in the blanks with the
numbers 1-9, in such a way that each
sequence adds up to the total (displayed in
small size) at the top or left. No number
may occur twice in the same sequence.
The totals for the horizontal and vertical
sequences containing the cursor square
are displayed “blinking”.
To enter a number in the cursor square,
simply press the number key. (The
number can be erased with CLEAR;
numbers already entered can be
“overwritten”.)
N
OTE
: As in SuDoku, you may retract and
replay a series of entries (with BACK
and FORWARD), “lock” numbers (with
ENTER), and use the “note pad” feature.
For details, see § 6.1.2.
6.3 S
LIDING
B
LOCKS
The display shows a block of letters with
one square blank. On Levels 1-4 there
are eight letters; on Levels 5-10 there are
1 2 8